1 //===--- Parser.cpp - C Language Family Parser ----------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Parser interfaces.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Parse/Parser.h"
15 #include "clang/Parse/ParseDiagnostic.h"
16 #include "clang/Parse/DeclSpec.h"
17 #include "clang/Parse/Scope.h"
18 #include "llvm/Support/raw_ostream.h"
19 #include "ExtensionRAIIObject.h"
20 #include "ParsePragma.h"
21 using namespace clang;
23 /// \brief A comment handler that passes comments found by the preprocessor
24 /// to the parser action.
25 class ActionCommentHandler : public CommentHandler {
29 explicit ActionCommentHandler(Action &Actions) : Actions(Actions) { }
31 virtual void HandleComment(Preprocessor &PP, SourceRange Comment) {
32 Actions.ActOnComment(Comment);
36 Parser::Parser(Preprocessor &pp, Action &actions)
37 : CrashInfo(*this), PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
38 GreaterThanIsOperator(true), TemplateParameterDepth(0) {
39 Tok.setKind(tok::eof);
42 ParenCount = BracketCount = BraceCount = 0;
43 ObjCImpDecl = DeclPtrTy();
45 // Add #pragma handlers. These are removed and destroyed in the
48 PragmaPackHandler(&PP.getIdentifierTable().get("pack"), actions));
49 PP.AddPragmaHandler(0, PackHandler.get());
51 UnusedHandler.reset(new
52 PragmaUnusedHandler(&PP.getIdentifierTable().get("unused"), actions,
54 PP.AddPragmaHandler(0, UnusedHandler.get());
57 PragmaWeakHandler(&PP.getIdentifierTable().get("weak"), actions));
58 PP.AddPragmaHandler(0, WeakHandler.get());
60 CommentHandler.reset(new ActionCommentHandler(actions));
61 PP.AddCommentHandler(CommentHandler.get());
64 /// If a crash happens while the parser is active, print out a line indicating
65 /// what the current token is.
66 void PrettyStackTraceParserEntry::print(llvm::raw_ostream &OS) const {
67 const Token &Tok = P.getCurToken();
68 if (Tok.is(tok::eof)) {
69 OS << "<eof> parser at end of file\n";
73 if (Tok.getLocation().isInvalid()) {
74 OS << "<unknown> parser at unknown location\n";
78 const Preprocessor &PP = P.getPreprocessor();
79 Tok.getLocation().print(OS, PP.getSourceManager());
80 if (Tok.isAnnotation())
81 OS << ": at annotation token \n";
83 OS << ": current parser token '" << PP.getSpelling(Tok) << "'\n";
87 DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
88 return Diags.Report(FullSourceLoc(Loc, PP.getSourceManager()), DiagID);
91 DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
92 return Diag(Tok.getLocation(), DiagID);
95 /// \brief Emits a diagnostic suggesting parentheses surrounding a
98 /// \param Loc The location where we'll emit the diagnostic.
99 /// \param Loc The kind of diagnostic to emit.
100 /// \param ParenRange Source range enclosing code that should be parenthesized.
101 void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
102 SourceRange ParenRange) {
103 SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
104 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
105 // We can't display the parentheses, so just dig the
106 // warning/error and return.
112 << CodeModificationHint::CreateInsertion(ParenRange.getBegin(), "(")
113 << CodeModificationHint::CreateInsertion(EndLoc, ")");
116 /// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'),
117 /// this helper function matches and consumes the specified RHS token if
118 /// present. If not present, it emits the specified diagnostic indicating
119 /// that the parser failed to match the RHS of the token at LHSLoc. LHSName
120 /// should be the name of the unmatched LHS token.
121 SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok,
122 SourceLocation LHSLoc) {
125 return ConsumeAnyToken();
127 SourceLocation R = Tok.getLocation();
128 const char *LHSName = "unknown";
129 diag::kind DID = diag::err_parse_error;
132 case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break;
133 case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break;
134 case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break;
135 case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break;
138 Diag(LHSLoc, diag::note_matching) << LHSName;
143 /// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the
144 /// input. If so, it is consumed and false is returned.
146 /// If the input is malformed, this emits the specified diagnostic. Next, if
147 /// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is
149 bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
150 const char *Msg, tok::TokenKind SkipToTok) {
151 if (Tok.is(ExpectedTok)) {
156 const char *Spelling = 0;
157 SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
158 if (EndLoc.isValid() &&
159 (Spelling = tok::getTokenSimpleSpelling(ExpectedTok))) {
160 // Show what code to insert to fix this problem.
163 << CodeModificationHint::CreateInsertion(EndLoc, Spelling);
165 Diag(Tok, DiagID) << Msg;
167 if (SkipToTok != tok::unknown)
168 SkipUntil(SkipToTok);
172 //===----------------------------------------------------------------------===//
174 //===----------------------------------------------------------------------===//
176 /// SkipUntil - Read tokens until we get to the specified token, then consume
177 /// it (unless DontConsume is true). Because we cannot guarantee that the
178 /// token will ever occur, this skips to the next token, or to some likely
179 /// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
182 /// If SkipUntil finds the specified token, it returns true, otherwise it
184 bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks,
185 bool StopAtSemi, bool DontConsume) {
186 // We always want this function to skip at least one token if the first token
187 // isn't T and if not at EOF.
188 bool isFirstTokenSkipped = true;
190 // If we found one of the tokens, stop and return true.
191 for (unsigned i = 0; i != NumToks; ++i) {
192 if (Tok.is(Toks[i])) {
194 // Noop, don't consume the token.
202 switch (Tok.getKind()) {
204 // Ran out of tokens.
208 // Recursively skip properly-nested parens.
210 SkipUntil(tok::r_paren, false);
213 // Recursively skip properly-nested square brackets.
215 SkipUntil(tok::r_square, false);
218 // Recursively skip properly-nested braces.
220 SkipUntil(tok::r_brace, false);
223 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
224 // Since the user wasn't looking for this token (if they were, it would
225 // already be handled), this isn't balanced. If there is a LHS token at a
226 // higher level, we will assume that this matches the unbalanced token
227 // and return it. Otherwise, this is a spurious RHS token, which we skip.
229 if (ParenCount && !isFirstTokenSkipped)
230 return false; // Matches something.
234 if (BracketCount && !isFirstTokenSkipped)
235 return false; // Matches something.
239 if (BraceCount && !isFirstTokenSkipped)
240 return false; // Matches something.
244 case tok::string_literal:
245 case tok::wide_string_literal:
246 ConsumeStringToken();
257 isFirstTokenSkipped = false;
261 //===----------------------------------------------------------------------===//
262 // Scope manipulation
263 //===----------------------------------------------------------------------===//
265 /// EnterScope - Start a new scope.
266 void Parser::EnterScope(unsigned ScopeFlags) {
267 if (NumCachedScopes) {
268 Scope *N = ScopeCache[--NumCachedScopes];
269 N->Init(CurScope, ScopeFlags);
272 CurScope = new Scope(CurScope, ScopeFlags);
276 /// ExitScope - Pop a scope off the scope stack.
277 void Parser::ExitScope() {
278 assert(CurScope && "Scope imbalance!");
280 // Inform the actions module that this scope is going away if there are any
282 if (!CurScope->decl_empty())
283 Actions.ActOnPopScope(Tok.getLocation(), CurScope);
285 Scope *OldScope = CurScope;
286 CurScope = OldScope->getParent();
288 if (NumCachedScopes == ScopeCacheSize)
291 ScopeCache[NumCachedScopes++] = OldScope;
297 //===----------------------------------------------------------------------===//
298 // C99 6.9: External Definitions.
299 //===----------------------------------------------------------------------===//
302 // If we still have scopes active, delete the scope tree.
305 // Free the scope cache.
306 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
307 delete ScopeCache[i];
309 // Remove the pragma handlers we installed.
310 PP.RemovePragmaHandler(0, PackHandler.get());
312 PP.RemovePragmaHandler(0, UnusedHandler.get());
313 UnusedHandler.reset();
314 PP.RemovePragmaHandler(0, WeakHandler.get());
316 PP.RemoveCommentHandler(CommentHandler.get());
319 /// Initialize - Warm up the parser.
321 void Parser::Initialize() {
322 // Prime the lexer look-ahead.
325 // Create the translation unit scope. Install it as the current scope.
326 assert(CurScope == 0 && "A scope is already active?");
327 EnterScope(Scope::DeclScope);
328 Actions.ActOnTranslationUnitScope(Tok.getLocation(), CurScope);
330 if (Tok.is(tok::eof) &&
331 !getLang().CPlusPlus) // Empty source file is an extension in C
332 Diag(Tok, diag::ext_empty_source_file);
334 // Initialization for Objective-C context sensitive keywords recognition.
335 // Referenced in Parser::ParseObjCTypeQualifierList.
336 if (getLang().ObjC1) {
337 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
338 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
339 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
340 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
341 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
342 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
345 Ident_super = &PP.getIdentifierTable().get("super");
348 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
349 /// action tells us to. This returns true if the EOF was encountered.
350 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
351 Result = DeclGroupPtrTy();
352 if (Tok.is(tok::eof)) {
353 Actions.ActOnEndOfTranslationUnit();
357 Result = ParseExternalDeclaration();
361 /// ParseTranslationUnit:
362 /// translation-unit: [C99 6.9]
363 /// external-declaration
364 /// translation-unit external-declaration
365 void Parser::ParseTranslationUnit() {
369 while (!ParseTopLevelDecl(Res))
373 assert(CurScope == 0 && "Scope imbalance!");
376 /// ParseExternalDeclaration:
378 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
379 /// function-definition
381 /// [C++0x] empty-declaration
382 /// [GNU] asm-definition
383 /// [GNU] __extension__ external-declaration
384 /// [OBJC] objc-class-definition
385 /// [OBJC] objc-class-declaration
386 /// [OBJC] objc-alias-declaration
387 /// [OBJC] objc-protocol-definition
388 /// [OBJC] objc-method-definition
390 /// [C++] linkage-specification
391 /// [GNU] asm-definition:
392 /// simple-asm-expr ';'
394 /// [C++0x] empty-declaration:
397 /// [C++0x/GNU] 'extern' 'template' declaration
398 Parser::DeclGroupPtrTy Parser::ParseExternalDeclaration() {
399 DeclPtrTy SingleDecl;
400 switch (Tok.getKind()) {
402 if (!getLang().CPlusPlus0x)
403 Diag(Tok, diag::ext_top_level_semi)
404 << CodeModificationHint::CreateRemoval(SourceRange(Tok.getLocation()));
407 // TODO: Invoke action for top-level semicolon.
408 return DeclGroupPtrTy();
410 Diag(Tok, diag::err_expected_external_declaration);
412 return DeclGroupPtrTy();
414 Diag(Tok, diag::err_expected_external_declaration);
415 return DeclGroupPtrTy();
416 case tok::kw___extension__: {
417 // __extension__ silences extension warnings in the subexpression.
418 ExtensionRAIIObject O(Diags); // Use RAII to do this.
420 return ParseExternalDeclaration();
423 OwningExprResult Result(ParseSimpleAsm());
425 ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
426 "top-level asm block");
428 if (Result.isInvalid())
429 return DeclGroupPtrTy();
430 SingleDecl = Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), move(Result));
434 // @ is not a legal token unless objc is enabled, no need to check for ObjC.
435 /// FIXME: ParseObjCAtDirectives should return a DeclGroup for things like
437 SingleDecl = ParseObjCAtDirectives();
441 if (!getLang().ObjC1) {
442 Diag(Tok, diag::err_expected_external_declaration);
444 return DeclGroupPtrTy();
446 SingleDecl = ParseObjCMethodDefinition();
448 case tok::code_completion:
449 Actions.CodeCompleteOrdinaryName(CurScope);
451 return ParseExternalDeclaration();
453 case tok::kw_namespace:
454 case tok::kw_typedef:
455 case tok::kw_template:
456 case tok::kw_export: // As in 'export template'
457 case tok::kw_static_assert:
458 // A function definition cannot start with a these keywords.
460 SourceLocation DeclEnd;
461 return ParseDeclaration(Declarator::FileContext, DeclEnd);
464 if (getLang().CPlusPlus && NextToken().is(tok::kw_template)) {
466 SourceLocation ExternLoc = ConsumeToken();
467 SourceLocation TemplateLoc = ConsumeToken();
468 SourceLocation DeclEnd;
469 return Actions.ConvertDeclToDeclGroup(
470 ParseExplicitInstantiation(ExternLoc, TemplateLoc, DeclEnd));
473 // FIXME: Detect C++ linkage specifications here?
475 // Fall through to handle other declarations or function definitions.
478 // We can't tell whether this is a function-definition or declaration yet.
479 return ParseDeclarationOrFunctionDefinition();
482 // This routine returns a DeclGroup, if the thing we parsed only contains a
483 // single decl, convert it now.
484 return Actions.ConvertDeclToDeclGroup(SingleDecl);
487 /// \brief Determine whether the current token, if it occurs after a
488 /// declarator, continues a declaration or declaration list.
489 bool Parser::isDeclarationAfterDeclarator() {
490 return Tok.is(tok::equal) || // int X()= -> not a function def
491 Tok.is(tok::comma) || // int X(), -> not a function def
492 Tok.is(tok::semi) || // int X(); -> not a function def
493 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
494 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
495 (getLang().CPlusPlus &&
496 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
499 /// \brief Determine whether the current token, if it occurs after a
500 /// declarator, indicates the start of a function definition.
501 bool Parser::isStartOfFunctionDefinition() {
502 return Tok.is(tok::l_brace) || // int X() {}
503 (!getLang().CPlusPlus &&
504 isDeclarationSpecifier()) || // int X(f) int f; {}
505 (getLang().CPlusPlus &&
506 (Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
507 Tok.is(tok::kw_try))); // X() try { ... }
510 /// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or
511 /// a declaration. We can't tell which we have until we read up to the
512 /// compound-statement in function-definition. TemplateParams, if
513 /// non-NULL, provides the template parameters when we're parsing a
514 /// C++ template-declaration.
516 /// function-definition: [C99 6.9.1]
517 /// decl-specs declarator declaration-list[opt] compound-statement
518 /// [C90] function-definition: [C99 6.7.1] - implicit int result
519 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
521 /// declaration: [C99 6.7]
522 /// declaration-specifiers init-declarator-list[opt] ';'
523 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
524 /// [OMP] threadprivate-directive [TODO]
526 Parser::DeclGroupPtrTy
527 Parser::ParseDeclarationOrFunctionDefinition(AccessSpecifier AS) {
528 // Parse the common declaration-specifiers piece.
529 ParsingDeclSpec DS(*this);
530 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS);
532 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
533 // declaration-specifiers init-declarator-list[opt] ';'
534 if (Tok.is(tok::semi)) {
536 DeclPtrTy TheDecl = Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
537 DS.complete(TheDecl);
538 return Actions.ConvertDeclToDeclGroup(TheDecl);
541 // ObjC2 allows prefix attributes on class interfaces and protocols.
542 // FIXME: This still needs better diagnostics. We should only accept
543 // attributes here, no types, etc.
544 if (getLang().ObjC2 && Tok.is(tok::at)) {
545 SourceLocation AtLoc = ConsumeToken(); // the "@"
546 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
547 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
548 Diag(Tok, diag::err_objc_unexpected_attr);
549 SkipUntil(tok::semi); // FIXME: better skip?
550 return DeclGroupPtrTy();
555 const char *PrevSpec = 0;
557 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID))
558 Diag(AtLoc, DiagID) << PrevSpec;
561 if (Tok.isObjCAtKeyword(tok::objc_protocol))
562 TheDecl = ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
564 TheDecl = ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes());
565 return Actions.ConvertDeclToDeclGroup(TheDecl);
568 // If the declspec consisted only of 'extern' and we have a string
569 // literal following it, this must be a C++ linkage specifier like
571 if (Tok.is(tok::string_literal) && getLang().CPlusPlus &&
572 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
573 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
575 DeclPtrTy TheDecl = ParseLinkage(Declarator::FileContext);
576 return Actions.ConvertDeclToDeclGroup(TheDecl);
579 return ParseDeclGroup(DS, Declarator::FileContext, true);
582 /// ParseFunctionDefinition - We parsed and verified that the specified
583 /// Declarator is well formed. If this is a K&R-style function, read the
584 /// parameters declaration-list, then start the compound-statement.
586 /// function-definition: [C99 6.9.1]
587 /// decl-specs declarator declaration-list[opt] compound-statement
588 /// [C90] function-definition: [C99 6.7.1] - implicit int result
589 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
590 /// [C++] function-definition: [C++ 8.4]
591 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
593 /// [C++] function-definition: [C++ 8.4]
594 /// decl-specifier-seq[opt] declarator function-try-block
596 Parser::DeclPtrTy Parser::ParseFunctionDefinition(ParsingDeclarator &D,
597 const ParsedTemplateInfo &TemplateInfo) {
598 const DeclaratorChunk &FnTypeInfo = D.getTypeObject(0);
599 assert(FnTypeInfo.Kind == DeclaratorChunk::Function &&
600 "This isn't a function declarator!");
601 const DeclaratorChunk::FunctionTypeInfo &FTI = FnTypeInfo.Fun;
603 // If this is C90 and the declspecs were completely missing, fudge in an
604 // implicit int. We do this here because this is the only place where
605 // declaration-specifiers are completely optional in the grammar.
606 if (getLang().ImplicitInt && D.getDeclSpec().isEmpty()) {
607 const char *PrevSpec;
609 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
610 D.getIdentifierLoc(),
612 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
615 // If this declaration was formed with a K&R-style identifier list for the
616 // arguments, parse declarations for all of the args next.
617 // int foo(a,b) int a; float b; {}
618 if (!FTI.hasPrototype && FTI.NumArgs != 0)
619 ParseKNRParamDeclarations(D);
621 // We should have either an opening brace or, in a C++ constructor,
622 // we may have a colon.
623 if (Tok.isNot(tok::l_brace) && Tok.isNot(tok::colon) &&
624 Tok.isNot(tok::kw_try)) {
625 Diag(Tok, diag::err_expected_fn_body);
627 // Skip over garbage, until we get to '{'. Don't eat the '{'.
628 SkipUntil(tok::l_brace, true, true);
630 // If we didn't find the '{', bail out.
631 if (Tok.isNot(tok::l_brace))
635 // Enter a scope for the function body.
636 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
638 // Tell the actions module that we have entered a function definition with the
639 // specified Declarator for the function.
640 DeclPtrTy Res = TemplateInfo.TemplateParams?
641 Actions.ActOnStartOfFunctionTemplateDef(CurScope,
642 Action::MultiTemplateParamsArg(Actions,
643 TemplateInfo.TemplateParams->data(),
644 TemplateInfo.TemplateParams->size()),
646 : Actions.ActOnStartOfFunctionDef(CurScope, D);
648 // Break out of the ParsingDeclarator context before we parse the body.
651 // Break out of the ParsingDeclSpec context, too. This const_cast is
652 // safe because we're always the sole owner.
653 D.getMutableDeclSpec().abort();
655 if (Tok.is(tok::kw_try))
656 return ParseFunctionTryBlock(Res);
658 // If we have a colon, then we're probably parsing a C++
660 if (Tok.is(tok::colon))
661 ParseConstructorInitializer(Res);
663 Actions.ActOnDefaultCtorInitializers(Res);
665 return ParseFunctionStatementBody(Res);
668 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
669 /// types for a function with a K&R-style identifier list for arguments.
670 void Parser::ParseKNRParamDeclarations(Declarator &D) {
671 // We know that the top-level of this declarator is a function.
672 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
674 // Enter function-declaration scope, limiting any declarators to the
675 // function prototype scope, including parameter declarators.
676 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope|Scope::DeclScope);
678 // Read all the argument declarations.
679 while (isDeclarationSpecifier()) {
680 SourceLocation DSStart = Tok.getLocation();
682 // Parse the common declaration-specifiers piece.
684 ParseDeclarationSpecifiers(DS);
686 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
687 // least one declarator'.
688 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
689 // the declarations though. It's trivial to ignore them, really hard to do
690 // anything else with them.
691 if (Tok.is(tok::semi)) {
692 Diag(DSStart, diag::err_declaration_does_not_declare_param);
697 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
699 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
700 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
701 Diag(DS.getStorageClassSpecLoc(),
702 diag::err_invalid_storage_class_in_func_decl);
703 DS.ClearStorageClassSpecs();
705 if (DS.isThreadSpecified()) {
706 Diag(DS.getThreadSpecLoc(),
707 diag::err_invalid_storage_class_in_func_decl);
708 DS.ClearStorageClassSpecs();
711 // Parse the first declarator attached to this declspec.
712 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
713 ParseDeclarator(ParmDeclarator);
715 // Handle the full declarator list.
717 Action::AttrTy *AttrList;
718 // If attributes are present, parse them.
719 if (Tok.is(tok::kw___attribute))
720 // FIXME: attach attributes too.
721 AttrList = ParseAttributes();
723 // Ask the actions module to compute the type for this declarator.
724 Action::DeclPtrTy Param =
725 Actions.ActOnParamDeclarator(CurScope, ParmDeclarator);
728 // A missing identifier has already been diagnosed.
729 ParmDeclarator.getIdentifier()) {
731 // Scan the argument list looking for the correct param to apply this
733 for (unsigned i = 0; ; ++i) {
734 // C99 6.9.1p6: those declarators shall declare only identifiers from
735 // the identifier list.
736 if (i == FTI.NumArgs) {
737 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
738 << ParmDeclarator.getIdentifier();
742 if (FTI.ArgInfo[i].Ident == ParmDeclarator.getIdentifier()) {
743 // Reject redefinitions of parameters.
744 if (FTI.ArgInfo[i].Param) {
745 Diag(ParmDeclarator.getIdentifierLoc(),
746 diag::err_param_redefinition)
747 << ParmDeclarator.getIdentifier();
749 FTI.ArgInfo[i].Param = Param;
756 // If we don't have a comma, it is either the end of the list (a ';') or
757 // an error, bail out.
758 if (Tok.isNot(tok::comma))
761 // Consume the comma.
764 // Parse the next declarator.
765 ParmDeclarator.clear();
766 ParseDeclarator(ParmDeclarator);
769 if (Tok.is(tok::semi)) {
772 Diag(Tok, diag::err_parse_error);
773 // Skip to end of block or statement
774 SkipUntil(tok::semi, true);
775 if (Tok.is(tok::semi))
780 // The actions module must verify that all arguments were declared.
781 Actions.ActOnFinishKNRParamDeclarations(CurScope, D, Tok.getLocation());
785 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
786 /// allowed to be a wide string, and is not subject to character translation.
788 /// [GNU] asm-string-literal:
791 Parser::OwningExprResult Parser::ParseAsmStringLiteral() {
792 if (!isTokenStringLiteral()) {
793 Diag(Tok, diag::err_expected_string_literal);
797 OwningExprResult Res(ParseStringLiteralExpression());
798 if (Res.isInvalid()) return move(Res);
800 // TODO: Diagnose: wide string literal in 'asm'
807 /// [GNU] simple-asm-expr:
808 /// 'asm' '(' asm-string-literal ')'
810 Parser::OwningExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
811 assert(Tok.is(tok::kw_asm) && "Not an asm!");
812 SourceLocation Loc = ConsumeToken();
814 if (Tok.isNot(tok::l_paren)) {
815 Diag(Tok, diag::err_expected_lparen_after) << "asm";
819 Loc = ConsumeParen();
821 OwningExprResult Result(ParseAsmStringLiteral());
823 if (Result.isInvalid()) {
824 SkipUntil(tok::r_paren, true, true);
826 *EndLoc = Tok.getLocation();
829 Loc = MatchRHSPunctuation(tok::r_paren, Loc);
837 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
838 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
839 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
840 /// with a single annotation token representing the typename or C++ scope
842 /// This simplifies handling of C++ scope specifiers and allows efficient
843 /// backtracking without the need to re-parse and resolve nested-names and
845 /// It will mainly be called when we expect to treat identifiers as typenames
846 /// (if they are typenames). For example, in C we do not expect identifiers
847 /// inside expressions to be treated as typenames so it will not be called
848 /// for expressions in C.
849 /// The benefit for C/ObjC is that a typename will be annotated and
850 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
851 /// will not be called twice, once to check whether we have a declaration
852 /// specifier, and another one to get the actual type inside
853 /// ParseDeclarationSpecifiers).
855 /// This returns true if the token was annotated or an unrecoverable error
858 /// Note that this routine emits an error if you call it with ::new or ::delete
859 /// as the current tokens, so only call it in contexts where these are invalid.
860 bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext) {
861 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)
862 || Tok.is(tok::kw_typename)) &&
863 "Cannot be a type or scope token!");
865 if (Tok.is(tok::kw_typename)) {
866 // Parse a C++ typename-specifier, e.g., "typename T::type".
868 // typename-specifier:
869 // 'typename' '::' [opt] nested-name-specifier identifier
870 // 'typename' '::' [opt] nested-name-specifier template [opt]
871 // simple-template-id
872 SourceLocation TypenameLoc = ConsumeToken();
874 bool HadNestedNameSpecifier
875 = ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
876 if (!HadNestedNameSpecifier) {
877 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
882 if (Tok.is(tok::identifier)) {
883 // FIXME: check whether the next token is '<', first!
884 Ty = Actions.ActOnTypenameType(TypenameLoc, SS, *Tok.getIdentifierInfo(),
886 } else if (Tok.is(tok::annot_template_id)) {
887 TemplateIdAnnotation *TemplateId
888 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
889 if (TemplateId->Kind == TNK_Function_template) {
890 Diag(Tok, diag::err_typename_refers_to_non_type_template)
891 << Tok.getAnnotationRange();
895 AnnotateTemplateIdTokenAsType(0);
896 assert(Tok.is(tok::annot_typename) &&
897 "AnnotateTemplateIdTokenAsType isn't working properly");
898 if (Tok.getAnnotationValue())
899 Ty = Actions.ActOnTypenameType(TypenameLoc, SS, SourceLocation(),
900 Tok.getAnnotationValue());
904 Diag(Tok, diag::err_expected_type_name_after_typename)
909 Tok.setKind(tok::annot_typename);
910 Tok.setAnnotationValue(Ty.isInvalid()? 0 : Ty.get());
911 Tok.setAnnotationEndLoc(Tok.getLocation());
912 Tok.setLocation(TypenameLoc);
913 PP.AnnotateCachedTokens(Tok);
918 if (getLang().CPlusPlus)
919 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, EnteringContext);
921 if (Tok.is(tok::identifier)) {
922 // Determine whether the identifier is a type name.
923 if (TypeTy *Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
924 Tok.getLocation(), CurScope, &SS)) {
925 // This is a typename. Replace the current token in-place with an
926 // annotation type token.
927 Tok.setKind(tok::annot_typename);
928 Tok.setAnnotationValue(Ty);
929 Tok.setAnnotationEndLoc(Tok.getLocation());
930 if (SS.isNotEmpty()) // it was a C++ qualified type name.
931 Tok.setLocation(SS.getBeginLoc());
933 // In case the tokens were cached, have Preprocessor replace
934 // them with the annotation token.
935 PP.AnnotateCachedTokens(Tok);
939 if (!getLang().CPlusPlus) {
940 // If we're in C, we can't have :: tokens at all (the lexer won't return
941 // them). If the identifier is not a type, then it can't be scope either,
946 // If this is a template-id, annotate with a template-id or type token.
947 if (NextToken().is(tok::less)) {
949 UnqualifiedId TemplateName;
950 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
951 if (TemplateNameKind TNK
952 = Actions.isTemplateName(CurScope, SS, TemplateName,
953 /*ObjectType=*/0, EnteringContext,
955 // Consume the identifier.
957 if (AnnotateTemplateIdToken(Template, TNK, &SS, TemplateName)) {
958 // If an unrecoverable error occurred, we need to return true here,
959 // because the token stream is in a damaged state. We may not return
960 // a valid identifier.
961 return Tok.isNot(tok::identifier);
966 // The current token, which is either an identifier or a
967 // template-id, is not part of the annotation. Fall through to
968 // push that token back into the stream and complete the C++ scope
969 // specifier annotation.
972 if (Tok.is(tok::annot_template_id)) {
973 TemplateIdAnnotation *TemplateId
974 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
975 if (TemplateId->Kind == TNK_Type_template) {
976 // A template-id that refers to a type was parsed into a
977 // template-id annotation in a context where we weren't allowed
978 // to produce a type annotation token. Update the template-id
979 // annotation token to a type annotation token now.
980 AnnotateTemplateIdTokenAsType(&SS);
986 return Tok.isNot(tok::identifier) && Tok.isNot(tok::coloncolon);
988 // A C++ scope specifier that isn't followed by a typename.
989 // Push the current token back into the token stream (or revert it if it is
990 // cached) and use an annotation scope token for current token.
991 if (PP.isBacktrackEnabled())
992 PP.RevertCachedTokens(1);
995 Tok.setKind(tok::annot_cxxscope);
996 Tok.setAnnotationValue(SS.getScopeRep());
997 Tok.setAnnotationRange(SS.getRange());
999 // In case the tokens were cached, have Preprocessor replace them with the
1000 // annotation token.
1001 PP.AnnotateCachedTokens(Tok);
1005 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1006 /// annotates C++ scope specifiers and template-ids. This returns
1007 /// true if the token was annotated or there was an error that could not be
1010 /// Note that this routine emits an error if you call it with ::new or ::delete
1011 /// as the current tokens, so only call it in contexts where these are invalid.
1012 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1013 assert(getLang().CPlusPlus &&
1014 "Call sites of this function should be guarded by checking for C++");
1015 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1016 "Cannot be a type or scope token!");
1019 if (!ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, EnteringContext))
1020 return Tok.is(tok::annot_template_id);
1022 // Push the current token back into the token stream (or revert it if it is
1023 // cached) and use an annotation scope token for current token.
1024 if (PP.isBacktrackEnabled())
1025 PP.RevertCachedTokens(1);
1028 Tok.setKind(tok::annot_cxxscope);
1029 Tok.setAnnotationValue(SS.getScopeRep());
1030 Tok.setAnnotationRange(SS.getRange());
1032 // In case the tokens were cached, have Preprocessor replace them with the
1033 // annotation token.
1034 PP.AnnotateCachedTokens(Tok);
1038 // Anchor the Parser::FieldCallback vtable to this translation unit.
1039 // We use a spurious method instead of the destructor because
1040 // destroying FieldCallbacks can actually be slightly
1041 // performance-sensitive.
1042 void Parser::FieldCallback::_anchor() {