Parser.cpp revision 08b2c3743a29a2dddcf72e95f747760e213cdde7
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/Basic/Diagnostic.h" 16#include "clang/Parse/DeclSpec.h" 17#include "clang/Parse/Scope.h" 18#include "ExtensionRAIIObject.h" 19#include "ParsePragma.h" 20using namespace clang; 21 22Parser::Parser(Preprocessor &pp, Action &actions) 23 : PP(pp), Actions(actions), Diags(PP.getDiagnostics()) { 24 Tok.setKind(tok::eof); 25 CurScope = 0; 26 NumCachedScopes = 0; 27 ParenCount = BracketCount = BraceCount = 0; 28 ObjCImpDecl = 0; 29 30 // Add #pragma handlers. These are removed and destroyed in the 31 // destructor. 32 PackHandler = 33 new PragmaPackHandler(&PP.getIdentifierTable().get("pack"), actions); 34 PP.AddPragmaHandler(0, PackHandler); 35 36 // Instantiate a LexedMethodsForTopClass for all the non-nested classes. 37 PushTopClassStack(); 38} 39 40/// Out-of-line virtual destructor to provide home for Action class. 41Action::~Action() {} 42 43 44DiagnosticInfo Parser::Diag(SourceLocation Loc, unsigned DiagID) { 45 return Diags.Report(FullSourceLoc(Loc,PP.getSourceManager()), DiagID); 46} 47 48DiagnosticInfo Parser::Diag(const Token &Tok, unsigned DiagID) { 49 return Diag(Tok.getLocation(), DiagID); 50} 51 52/// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'), 53/// this helper function matches and consumes the specified RHS token if 54/// present. If not present, it emits the specified diagnostic indicating 55/// that the parser failed to match the RHS of the token at LHSLoc. LHSName 56/// should be the name of the unmatched LHS token. 57SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok, 58 SourceLocation LHSLoc) { 59 60 if (Tok.is(RHSTok)) 61 return ConsumeAnyToken(); 62 63 SourceLocation R = Tok.getLocation(); 64 const char *LHSName = "unknown"; 65 diag::kind DID = diag::err_parse_error; 66 switch (RHSTok) { 67 default: break; 68 case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break; 69 case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break; 70 case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break; 71 case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break; 72 } 73 Diag(Tok, DID); 74 Diag(LHSLoc, diag::err_matching) << LHSName; 75 SkipUntil(RHSTok); 76 return R; 77} 78 79/// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the 80/// input. If so, it is consumed and false is returned. 81/// 82/// If the input is malformed, this emits the specified diagnostic. Next, if 83/// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is 84/// returned. 85bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID, 86 const char *Msg, tok::TokenKind SkipToTok) { 87 if (Tok.is(ExpectedTok)) { 88 ConsumeAnyToken(); 89 return false; 90 } 91 92 Diag(Tok, DiagID) << Msg; 93 if (SkipToTok != tok::unknown) 94 SkipUntil(SkipToTok); 95 return true; 96} 97 98//===----------------------------------------------------------------------===// 99// Error recovery. 100//===----------------------------------------------------------------------===// 101 102/// SkipUntil - Read tokens until we get to the specified token, then consume 103/// it (unless DontConsume is true). Because we cannot guarantee that the 104/// token will ever occur, this skips to the next token, or to some likely 105/// good stopping point. If StopAtSemi is true, skipping will stop at a ';' 106/// character. 107/// 108/// If SkipUntil finds the specified token, it returns true, otherwise it 109/// returns false. 110bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks, 111 bool StopAtSemi, bool DontConsume) { 112 // We always want this function to skip at least one token if the first token 113 // isn't T and if not at EOF. 114 bool isFirstTokenSkipped = true; 115 while (1) { 116 // If we found one of the tokens, stop and return true. 117 for (unsigned i = 0; i != NumToks; ++i) { 118 if (Tok.is(Toks[i])) { 119 if (DontConsume) { 120 // Noop, don't consume the token. 121 } else { 122 ConsumeAnyToken(); 123 } 124 return true; 125 } 126 } 127 128 switch (Tok.getKind()) { 129 case tok::eof: 130 // Ran out of tokens. 131 return false; 132 133 case tok::l_paren: 134 // Recursively skip properly-nested parens. 135 ConsumeParen(); 136 SkipUntil(tok::r_paren, false); 137 break; 138 case tok::l_square: 139 // Recursively skip properly-nested square brackets. 140 ConsumeBracket(); 141 SkipUntil(tok::r_square, false); 142 break; 143 case tok::l_brace: 144 // Recursively skip properly-nested braces. 145 ConsumeBrace(); 146 SkipUntil(tok::r_brace, false); 147 break; 148 149 // Okay, we found a ']' or '}' or ')', which we think should be balanced. 150 // Since the user wasn't looking for this token (if they were, it would 151 // already be handled), this isn't balanced. If there is a LHS token at a 152 // higher level, we will assume that this matches the unbalanced token 153 // and return it. Otherwise, this is a spurious RHS token, which we skip. 154 case tok::r_paren: 155 if (ParenCount && !isFirstTokenSkipped) 156 return false; // Matches something. 157 ConsumeParen(); 158 break; 159 case tok::r_square: 160 if (BracketCount && !isFirstTokenSkipped) 161 return false; // Matches something. 162 ConsumeBracket(); 163 break; 164 case tok::r_brace: 165 if (BraceCount && !isFirstTokenSkipped) 166 return false; // Matches something. 167 ConsumeBrace(); 168 break; 169 170 case tok::string_literal: 171 case tok::wide_string_literal: 172 ConsumeStringToken(); 173 break; 174 case tok::semi: 175 if (StopAtSemi) 176 return false; 177 // FALL THROUGH. 178 default: 179 // Skip this token. 180 ConsumeToken(); 181 break; 182 } 183 isFirstTokenSkipped = false; 184 } 185} 186 187//===----------------------------------------------------------------------===// 188// Scope manipulation 189//===----------------------------------------------------------------------===// 190 191/// EnterScope - Start a new scope. 192void Parser::EnterScope(unsigned ScopeFlags) { 193 if (NumCachedScopes) { 194 Scope *N = ScopeCache[--NumCachedScopes]; 195 N->Init(CurScope, ScopeFlags); 196 CurScope = N; 197 } else { 198 CurScope = new Scope(CurScope, ScopeFlags); 199 } 200} 201 202/// ExitScope - Pop a scope off the scope stack. 203void Parser::ExitScope() { 204 assert(CurScope && "Scope imbalance!"); 205 206 // Inform the actions module that this scope is going away if there are any 207 // decls in it. 208 if (!CurScope->decl_empty()) 209 Actions.ActOnPopScope(Tok.getLocation(), CurScope); 210 211 Scope *OldScope = CurScope; 212 CurScope = OldScope->getParent(); 213 214 if (NumCachedScopes == ScopeCacheSize) 215 delete OldScope; 216 else 217 ScopeCache[NumCachedScopes++] = OldScope; 218} 219 220 221 222 223//===----------------------------------------------------------------------===// 224// C99 6.9: External Definitions. 225//===----------------------------------------------------------------------===// 226 227Parser::~Parser() { 228 // If we still have scopes active, delete the scope tree. 229 delete CurScope; 230 231 // Free the scope cache. 232 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i) 233 delete ScopeCache[i]; 234 235 // Remove the pragma handlers we installed. 236 PP.RemovePragmaHandler(0, PackHandler); 237 delete PackHandler; 238} 239 240/// Initialize - Warm up the parser. 241/// 242void Parser::Initialize() { 243 // Prime the lexer look-ahead. 244 ConsumeToken(); 245 246 // Create the translation unit scope. Install it as the current scope. 247 assert(CurScope == 0 && "A scope is already active?"); 248 EnterScope(Scope::DeclScope); 249 Actions.ActOnTranslationUnitScope(Tok.getLocation(), CurScope); 250 251 if (Tok.is(tok::eof) && 252 !getLang().CPlusPlus) // Empty source file is an extension in C 253 Diag(Tok, diag::ext_empty_source_file); 254 255 // Initialization for Objective-C context sensitive keywords recognition. 256 // Referenced in Parser::ParseObjCTypeQualifierList. 257 if (getLang().ObjC1) { 258 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in"); 259 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out"); 260 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout"); 261 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway"); 262 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy"); 263 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref"); 264 } 265 266 Ident_super = &PP.getIdentifierTable().get("super"); 267} 268 269/// ParseTopLevelDecl - Parse one top-level declaration, return whatever the 270/// action tells us to. This returns true if the EOF was encountered. 271bool Parser::ParseTopLevelDecl(DeclTy*& Result) { 272 Result = 0; 273 if (Tok.is(tok::eof)) { 274 Actions.ActOnEndOfTranslationUnit(); 275 return true; 276 } 277 278 Result = ParseExternalDeclaration(); 279 return false; 280} 281 282/// ParseTranslationUnit: 283/// translation-unit: [C99 6.9] 284/// external-declaration 285/// translation-unit external-declaration 286void Parser::ParseTranslationUnit() { 287 Initialize(); // pushes a scope. 288 289 DeclTy *Res; 290 while (!ParseTopLevelDecl(Res)) 291 /*parse them all*/; 292 293 ExitScope(); 294 assert(CurScope == 0 && "Scope imbalance!"); 295} 296 297/// ParseExternalDeclaration: 298/// external-declaration: [C99 6.9] 299/// function-definition 300/// declaration 301/// [EXT] ';' 302/// [GNU] asm-definition 303/// [GNU] __extension__ external-declaration 304/// [OBJC] objc-class-definition 305/// [OBJC] objc-class-declaration 306/// [OBJC] objc-alias-declaration 307/// [OBJC] objc-protocol-definition 308/// [OBJC] objc-method-definition 309/// [OBJC] @end 310/// 311/// [GNU] asm-definition: 312/// simple-asm-expr ';' 313/// 314Parser::DeclTy *Parser::ParseExternalDeclaration() { 315 switch (Tok.getKind()) { 316 case tok::semi: 317 Diag(Tok, diag::ext_top_level_semi); 318 ConsumeToken(); 319 // TODO: Invoke action for top-level semicolon. 320 return 0; 321 case tok::kw___extension__: { 322 // __extension__ silences extension warnings in the subexpression. 323 ExtensionRAIIObject O(Diags); // Use RAII to do this. 324 ConsumeToken(); 325 return ParseExternalDeclaration(); 326 } 327 case tok::kw_asm: { 328 ExprResult Result = ParseSimpleAsm(); 329 330 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 331 "top-level asm block"); 332 333 if (!Result.isInvalid) 334 return Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), Result.Val); 335 return 0; 336 } 337 case tok::at: 338 // @ is not a legal token unless objc is enabled, no need to check. 339 return ParseObjCAtDirectives(); 340 case tok::minus: 341 case tok::plus: 342 if (getLang().ObjC1) 343 return ParseObjCMethodDefinition(); 344 else { 345 Diag(Tok, diag::err_expected_external_declaration); 346 ConsumeToken(); 347 } 348 return 0; 349 case tok::kw_namespace: 350 case tok::kw_typedef: 351 // A function definition cannot start with a these keywords. 352 return ParseDeclaration(Declarator::FileContext); 353 default: 354 // We can't tell whether this is a function-definition or declaration yet. 355 return ParseDeclarationOrFunctionDefinition(); 356 } 357} 358 359/// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or 360/// a declaration. We can't tell which we have until we read up to the 361/// compound-statement in function-definition. 362/// 363/// function-definition: [C99 6.9.1] 364/// decl-specs declarator declaration-list[opt] compound-statement 365/// [C90] function-definition: [C99 6.7.1] - implicit int result 366/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement 367/// 368/// declaration: [C99 6.7] 369/// declaration-specifiers init-declarator-list[opt] ';' 370/// [!C99] init-declarator-list ';' [TODO: warn in c99 mode] 371/// [OMP] threadprivate-directive [TODO] 372/// 373Parser::DeclTy *Parser::ParseDeclarationOrFunctionDefinition() { 374 // Parse the common declaration-specifiers piece. 375 DeclSpec DS; 376 ParseDeclarationSpecifiers(DS); 377 378 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };" 379 // declaration-specifiers init-declarator-list[opt] ';' 380 if (Tok.is(tok::semi)) { 381 ConsumeToken(); 382 return Actions.ParsedFreeStandingDeclSpec(CurScope, DS); 383 } 384 385 // ObjC2 allows prefix attributes on class interfaces and protocols. 386 // FIXME: This still needs better diagnostics. We should only accept 387 // attributes here, no types, etc. 388 if (getLang().ObjC2 && Tok.is(tok::at)) { 389 SourceLocation AtLoc = ConsumeToken(); // the "@" 390 if (!Tok.isObjCAtKeyword(tok::objc_interface) && 391 !Tok.isObjCAtKeyword(tok::objc_protocol)) { 392 Diag(Tok, diag::err_objc_unexpected_attr); 393 SkipUntil(tok::semi); // FIXME: better skip? 394 return 0; 395 } 396 const char *PrevSpec = 0; 397 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec)) 398 Diag(AtLoc, diag::err_invalid_decl_spec_combination) << PrevSpec; 399 if (Tok.isObjCAtKeyword(tok::objc_protocol)) 400 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes()); 401 return ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()); 402 } 403 404 // If the declspec consisted only of 'extern' and we have a string 405 // literal following it, this must be a C++ linkage specifier like 406 // 'extern "C"'. 407 if (Tok.is(tok::string_literal) && getLang().CPlusPlus && 408 DS.getStorageClassSpec() == DeclSpec::SCS_extern && 409 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) 410 return ParseLinkage(Declarator::FileContext); 411 412 // Parse the first declarator. 413 Declarator DeclaratorInfo(DS, Declarator::FileContext); 414 ParseDeclarator(DeclaratorInfo); 415 // Error parsing the declarator? 416 if (!DeclaratorInfo.hasName()) { 417 // If so, skip until the semi-colon or a }. 418 SkipUntil(tok::r_brace, true); 419 if (Tok.is(tok::semi)) 420 ConsumeToken(); 421 return 0; 422 } 423 424 // If the declarator is the start of a function definition, handle it. 425 if (Tok.is(tok::equal) || // int X()= -> not a function def 426 Tok.is(tok::comma) || // int X(), -> not a function def 427 Tok.is(tok::semi) || // int X(); -> not a function def 428 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def 429 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def 430 (getLang().CPlusPlus && 431 Tok.is(tok::l_paren)) ) { // int X(0) -> not a function def [C++] 432 // FALL THROUGH. 433 } else if (DeclaratorInfo.isFunctionDeclarator() && 434 (Tok.is(tok::l_brace) || // int X() {} 435 ( !getLang().CPlusPlus && 436 isDeclarationSpecifier() ))) { // int X(f) int f; {} 437 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 438 Diag(Tok, diag::err_function_declared_typedef); 439 440 if (Tok.is(tok::l_brace)) { 441 // This recovery skips the entire function body. It would be nice 442 // to simply call ParseFunctionDefintion() below, however Sema 443 // assumes the declarator represents a function, not a typedef. 444 ConsumeBrace(); 445 SkipUntil(tok::r_brace, true); 446 } else { 447 SkipUntil(tok::semi); 448 } 449 return 0; 450 } 451 return ParseFunctionDefinition(DeclaratorInfo); 452 } else { 453 if (DeclaratorInfo.isFunctionDeclarator()) 454 Diag(Tok, diag::err_expected_fn_body); 455 else 456 Diag(Tok, diag::err_expected_after_declarator); 457 SkipUntil(tok::semi); 458 return 0; 459 } 460 461 // Parse the init-declarator-list for a normal declaration. 462 return ParseInitDeclaratorListAfterFirstDeclarator(DeclaratorInfo); 463} 464 465/// ParseFunctionDefinition - We parsed and verified that the specified 466/// Declarator is well formed. If this is a K&R-style function, read the 467/// parameters declaration-list, then start the compound-statement. 468/// 469/// function-definition: [C99 6.9.1] 470/// decl-specs declarator declaration-list[opt] compound-statement 471/// [C90] function-definition: [C99 6.7.1] - implicit int result 472/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement 473/// [C++] function-definition: [C++ 8.4] 474/// decl-specifier-seq[opt] declarator ctor-initializer[opt] function-body 475/// [C++] function-definition: [C++ 8.4] 476/// decl-specifier-seq[opt] declarator function-try-block [TODO] 477/// 478Parser::DeclTy *Parser::ParseFunctionDefinition(Declarator &D) { 479 const DeclaratorChunk &FnTypeInfo = D.getTypeObject(0); 480 assert(FnTypeInfo.Kind == DeclaratorChunk::Function && 481 "This isn't a function declarator!"); 482 const DeclaratorChunk::FunctionTypeInfo &FTI = FnTypeInfo.Fun; 483 484 // If this is C90 and the declspecs were completely missing, fudge in an 485 // implicit int. We do this here because this is the only place where 486 // declaration-specifiers are completely optional in the grammar. 487 if (getLang().ImplicitInt && D.getDeclSpec().getParsedSpecifiers() == 0) { 488 const char *PrevSpec; 489 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int, 490 D.getIdentifierLoc(), 491 PrevSpec); 492 } 493 494 // If this declaration was formed with a K&R-style identifier list for the 495 // arguments, parse declarations for all of the args next. 496 // int foo(a,b) int a; float b; {} 497 if (!FTI.hasPrototype && FTI.NumArgs != 0) 498 ParseKNRParamDeclarations(D); 499 500 if (getLang().CPlusPlus && Tok.is(tok::colon)) { 501 502 } 503 504 // We should have either an opening brace or, in a C++ constructor, 505 // we may have a colon. 506 if (Tok.isNot(tok::l_brace) && Tok.isNot(tok::colon)) { 507 Diag(Tok, diag::err_expected_fn_body); 508 509 // Skip over garbage, until we get to '{'. Don't eat the '{'. 510 SkipUntil(tok::l_brace, true, true); 511 512 // If we didn't find the '{', bail out. 513 if (Tok.isNot(tok::l_brace)) 514 return 0; 515 } 516 517 // Enter a scope for the function body. 518 EnterScope(Scope::FnScope|Scope::DeclScope); 519 520 // Tell the actions module that we have entered a function definition with the 521 // specified Declarator for the function. 522 DeclTy *Res = Actions.ActOnStartOfFunctionDef(CurScope, D); 523 524 // If we have a colon, then we're probably parsing a C++ 525 // ctor-initializer. 526 if (Tok.is(tok::colon)) 527 ParseConstructorInitializer(Res); 528 529 SourceLocation BraceLoc = Tok.getLocation(); 530 return ParseFunctionStatementBody(Res, BraceLoc, BraceLoc); 531} 532 533/// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides 534/// types for a function with a K&R-style identifier list for arguments. 535void Parser::ParseKNRParamDeclarations(Declarator &D) { 536 // We know that the top-level of this declarator is a function. 537 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 538 539 // Enter function-declaration scope, limiting any declarators to the 540 // function prototype scope, including parameter declarators. 541 EnterScope(Scope::FnScope|Scope::DeclScope); 542 543 // Read all the argument declarations. 544 while (isDeclarationSpecifier()) { 545 SourceLocation DSStart = Tok.getLocation(); 546 547 // Parse the common declaration-specifiers piece. 548 DeclSpec DS; 549 ParseDeclarationSpecifiers(DS); 550 551 // C99 6.9.1p6: 'each declaration in the declaration list shall have at 552 // least one declarator'. 553 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with 554 // the declarations though. It's trivial to ignore them, really hard to do 555 // anything else with them. 556 if (Tok.is(tok::semi)) { 557 Diag(DSStart, diag::err_declaration_does_not_declare_param); 558 ConsumeToken(); 559 continue; 560 } 561 562 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other 563 // than register. 564 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 565 DS.getStorageClassSpec() != DeclSpec::SCS_register) { 566 Diag(DS.getStorageClassSpecLoc(), 567 diag::err_invalid_storage_class_in_func_decl); 568 DS.ClearStorageClassSpecs(); 569 } 570 if (DS.isThreadSpecified()) { 571 Diag(DS.getThreadSpecLoc(), 572 diag::err_invalid_storage_class_in_func_decl); 573 DS.ClearStorageClassSpecs(); 574 } 575 576 // Parse the first declarator attached to this declspec. 577 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext); 578 ParseDeclarator(ParmDeclarator); 579 580 // Handle the full declarator list. 581 while (1) { 582 DeclTy *AttrList; 583 // If attributes are present, parse them. 584 if (Tok.is(tok::kw___attribute)) 585 // FIXME: attach attributes too. 586 AttrList = ParseAttributes(); 587 588 // Ask the actions module to compute the type for this declarator. 589 Action::DeclTy *Param = 590 Actions.ActOnParamDeclarator(CurScope, ParmDeclarator); 591 592 if (Param && 593 // A missing identifier has already been diagnosed. 594 ParmDeclarator.getIdentifier()) { 595 596 // Scan the argument list looking for the correct param to apply this 597 // type. 598 for (unsigned i = 0; ; ++i) { 599 // C99 6.9.1p6: those declarators shall declare only identifiers from 600 // the identifier list. 601 if (i == FTI.NumArgs) { 602 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param) 603 << ParmDeclarator.getIdentifier(); 604 break; 605 } 606 607 if (FTI.ArgInfo[i].Ident == ParmDeclarator.getIdentifier()) { 608 // Reject redefinitions of parameters. 609 if (FTI.ArgInfo[i].Param) { 610 Diag(ParmDeclarator.getIdentifierLoc(), 611 diag::err_param_redefinition) 612 << ParmDeclarator.getIdentifier(); 613 } else { 614 FTI.ArgInfo[i].Param = Param; 615 } 616 break; 617 } 618 } 619 } 620 621 // If we don't have a comma, it is either the end of the list (a ';') or 622 // an error, bail out. 623 if (Tok.isNot(tok::comma)) 624 break; 625 626 // Consume the comma. 627 ConsumeToken(); 628 629 // Parse the next declarator. 630 ParmDeclarator.clear(); 631 ParseDeclarator(ParmDeclarator); 632 } 633 634 if (Tok.is(tok::semi)) { 635 ConsumeToken(); 636 } else { 637 Diag(Tok, diag::err_parse_error); 638 // Skip to end of block or statement 639 SkipUntil(tok::semi, true); 640 if (Tok.is(tok::semi)) 641 ConsumeToken(); 642 } 643 } 644 645 // Leave prototype scope. 646 ExitScope(); 647 648 // The actions module must verify that all arguments were declared. 649} 650 651 652/// ParseAsmStringLiteral - This is just a normal string-literal, but is not 653/// allowed to be a wide string, and is not subject to character translation. 654/// 655/// [GNU] asm-string-literal: 656/// string-literal 657/// 658Parser::ExprResult Parser::ParseAsmStringLiteral() { 659 if (!isTokenStringLiteral()) { 660 Diag(Tok, diag::err_expected_string_literal); 661 return true; 662 } 663 664 ExprResult Res = ParseStringLiteralExpression(); 665 if (Res.isInvalid) return true; 666 667 // TODO: Diagnose: wide string literal in 'asm' 668 669 return Res; 670} 671 672/// ParseSimpleAsm 673/// 674/// [GNU] simple-asm-expr: 675/// 'asm' '(' asm-string-literal ')' 676/// 677Parser::ExprResult Parser::ParseSimpleAsm() { 678 assert(Tok.is(tok::kw_asm) && "Not an asm!"); 679 SourceLocation Loc = ConsumeToken(); 680 681 if (Tok.isNot(tok::l_paren)) { 682 Diag(Tok, diag::err_expected_lparen_after) << "asm"; 683 return true; 684 } 685 686 ConsumeParen(); 687 688 ExprResult Result = ParseAsmStringLiteral(); 689 690 if (Result.isInvalid) 691 SkipUntil(tok::r_paren); 692 else 693 MatchRHSPunctuation(tok::r_paren, Loc); 694 695 return Result; 696} 697 698/// TryAnnotateTypeOrScopeToken - If the current token position is on a 699/// typename (possibly qualified in C++) or a C++ scope specifier not followed 700/// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens 701/// with a single annotation token representing the typename or C++ scope 702/// respectively. 703/// This simplifies handling of C++ scope specifiers and allows efficient 704/// backtracking without the need to re-parse and resolve nested-names and 705/// typenames. 706void Parser::TryAnnotateTypeOrScopeToken() { 707 if (Tok.is(tok::annot_qualtypename) || Tok.is(tok::annot_cxxscope)) 708 return; 709 710 CXXScopeSpec SS; 711 if (isTokenCXXScopeSpecifier()) 712 ParseCXXScopeSpecifier(SS); 713 714 if (Tok.is(tok::identifier)) { 715 TypeTy *Ty = Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope, &SS); 716 if (Ty) { 717 // This is a typename. Replace the current token in-place with an 718 // annotation type token. 719 Tok.setKind(tok::annot_qualtypename); 720 Tok.setAnnotationValue(Ty); 721 Tok.setAnnotationEndLoc(Tok.getLocation()); 722 if (SS.isNotEmpty()) // it was a C++ qualified type name. 723 Tok.setLocation(SS.getBeginLoc()); 724 725 // In case the tokens were cached, have Preprocessor replace them with the 726 // annotation token. 727 PP.AnnotateCachedTokens(Tok); 728 return; 729 } 730 } 731 732 if (SS.isNotEmpty()) { 733 // A C++ scope specifier that isn't followed by a typename. 734 // Push the current token back into the token stream (or revert it if it is 735 // cached) and use an annotation scope token for current token. 736 if (PP.isBacktrackEnabled()) 737 PP.RevertCachedTokens(1); 738 else 739 PP.EnterToken(Tok); 740 Tok.setKind(tok::annot_cxxscope); 741 Tok.setAnnotationValue(SS.getScopeRep()); 742 Tok.setAnnotationRange(SS.getRange()); 743 744 // In case the tokens were cached, have Preprocessor replace them with the 745 // annotation token. 746 PP.AnnotateCachedTokens(Tok); 747 } 748} 749 750/// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only 751/// annotates C++ scope specifiers. 752void Parser::TryAnnotateScopeToken() { 753 if (Tok.is(tok::annot_cxxscope)) 754 return; 755 756 if (isTokenCXXScopeSpecifier()) { 757 CXXScopeSpec SS; 758 ParseCXXScopeSpecifier(SS); 759 760 // Push the current token back into the token stream (or revert it if it is 761 // cached) and use an annotation scope token for current token. 762 if (PP.isBacktrackEnabled()) 763 PP.RevertCachedTokens(1); 764 else 765 PP.EnterToken(Tok); 766 Tok.setKind(tok::annot_cxxscope); 767 Tok.setAnnotationValue(SS.getScopeRep()); 768 Tok.setAnnotationRange(SS.getRange()); 769 770 // In case the tokens were cached, have Preprocessor replace them with the 771 // annotation token. 772 PP.AnnotateCachedTokens(Tok); 773 } 774} 775