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/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/Parse/ParseDiagnostic.h"
19 #include "clang/Parse/RAIIObjectsForParser.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/ParsedTemplate.h"
22 #include "clang/Sema/Scope.h"
23 using namespace clang;
27 /// \brief A comment handler that passes comments found by the preprocessor
28 /// to the parser action.
29 class ActionCommentHandler : public CommentHandler {
33 explicit ActionCommentHandler(Sema &S) : S(S) { }
35 bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
36 S.ActOnComment(Comment);
40 } // end anonymous namespace
42 IdentifierInfo *Parser::getSEHExceptKeyword() {
43 // __except is accepted as a (contextual) keyword
44 if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
45 Ident__except = PP.getIdentifierInfo("__except");
50 Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
51 : PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
52 GreaterThanIsOperator(true), ColonIsSacred(false),
53 InMessageExpression(false), TemplateParameterDepth(0),
54 ParsingInObjCContainer(false) {
55 SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
57 Tok.setKind(tok::eof);
58 Actions.CurScope = nullptr;
60 CurParsedObjCImpl = nullptr;
62 // Add #pragma handlers. These are removed and destroyed in the
64 initializePragmaHandlers();
66 CommentSemaHandler.reset(new ActionCommentHandler(actions));
67 PP.addCommentHandler(CommentSemaHandler.get());
69 PP.setCodeCompletionHandler(*this);
72 DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
73 return Diags.Report(Loc, DiagID);
76 DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
77 return Diag(Tok.getLocation(), DiagID);
80 /// \brief Emits a diagnostic suggesting parentheses surrounding a
83 /// \param Loc The location where we'll emit the diagnostic.
84 /// \param DK The kind of diagnostic to emit.
85 /// \param ParenRange Source range enclosing code that should be parenthesized.
86 void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
87 SourceRange ParenRange) {
88 SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
89 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
90 // We can't display the parentheses, so just dig the
91 // warning/error and return.
97 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
98 << FixItHint::CreateInsertion(EndLoc, ")");
101 static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
102 switch (ExpectedTok) {
104 return Tok.is(tok::colon) || Tok.is(tok::comma); // : or , for ;
105 default: return false;
109 bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
111 if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) {
116 // Detect common single-character typos and resume.
117 if (IsCommonTypo(ExpectedTok, Tok)) {
118 SourceLocation Loc = Tok.getLocation();
120 DiagnosticBuilder DB = Diag(Loc, DiagID);
121 DB << FixItHint::CreateReplacement(
122 SourceRange(Loc), tok::getPunctuatorSpelling(ExpectedTok));
123 if (DiagID == diag::err_expected)
125 else if (DiagID == diag::err_expected_after)
126 DB << Msg << ExpectedTok;
131 // Pretend there wasn't a problem.
136 SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
137 const char *Spelling = nullptr;
138 if (EndLoc.isValid())
139 Spelling = tok::getPunctuatorSpelling(ExpectedTok);
141 DiagnosticBuilder DB =
143 ? Diag(EndLoc, DiagID) << FixItHint::CreateInsertion(EndLoc, Spelling)
145 if (DiagID == diag::err_expected)
147 else if (DiagID == diag::err_expected_after)
148 DB << Msg << ExpectedTok;
155 bool Parser::ExpectAndConsumeSemi(unsigned DiagID) {
156 if (TryConsumeToken(tok::semi))
159 if (Tok.is(tok::code_completion)) {
160 handleUnexpectedCodeCompletionToken();
164 if ((Tok.is(tok::r_paren) || Tok.is(tok::r_square)) &&
165 NextToken().is(tok::semi)) {
166 Diag(Tok, diag::err_extraneous_token_before_semi)
167 << PP.getSpelling(Tok)
168 << FixItHint::CreateRemoval(Tok.getLocation());
169 ConsumeAnyToken(); // The ')' or ']'.
170 ConsumeToken(); // The ';'.
174 return ExpectAndConsume(tok::semi, DiagID);
177 void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, unsigned TST) {
178 if (!Tok.is(tok::semi)) return;
180 bool HadMultipleSemis = false;
181 SourceLocation StartLoc = Tok.getLocation();
182 SourceLocation EndLoc = Tok.getLocation();
185 while ((Tok.is(tok::semi) && !Tok.isAtStartOfLine())) {
186 HadMultipleSemis = true;
187 EndLoc = Tok.getLocation();
191 // C++11 allows extra semicolons at namespace scope, but not in any of the
193 if (Kind == OutsideFunction && getLangOpts().CPlusPlus) {
194 if (getLangOpts().CPlusPlus11)
195 Diag(StartLoc, diag::warn_cxx98_compat_top_level_semi)
196 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
198 Diag(StartLoc, diag::ext_extra_semi_cxx11)
199 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
203 if (Kind != AfterMemberFunctionDefinition || HadMultipleSemis)
204 Diag(StartLoc, diag::ext_extra_semi)
205 << Kind << DeclSpec::getSpecifierName((DeclSpec::TST)TST,
206 Actions.getASTContext().getPrintingPolicy())
207 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
209 // A single semicolon is valid after a member function definition.
210 Diag(StartLoc, diag::warn_extra_semi_after_mem_fn_def)
211 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
214 bool Parser::expectIdentifier() {
215 if (Tok.is(tok::identifier))
217 if (const auto *II = Tok.getIdentifierInfo()) {
218 if (II->isCPlusPlusKeyword(getLangOpts())) {
219 Diag(Tok, diag::err_expected_token_instead_of_objcxx_keyword)
220 << tok::identifier << Tok.getIdentifierInfo();
221 // Objective-C++: Recover by treating this keyword as a valid identifier.
225 Diag(Tok, diag::err_expected) << tok::identifier;
229 //===----------------------------------------------------------------------===//
231 //===----------------------------------------------------------------------===//
233 static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
234 return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
237 /// SkipUntil - Read tokens until we get to the specified token, then consume
238 /// it (unless no flag StopBeforeMatch). Because we cannot guarantee that the
239 /// token will ever occur, this skips to the next token, or to some likely
240 /// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
243 /// If SkipUntil finds the specified token, it returns true, otherwise it
245 bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
246 // We always want this function to skip at least one token if the first token
247 // isn't T and if not at EOF.
248 bool isFirstTokenSkipped = true;
250 // If we found one of the tokens, stop and return true.
251 for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
252 if (Tok.is(Toks[i])) {
253 if (HasFlagsSet(Flags, StopBeforeMatch)) {
254 // Noop, don't consume the token.
262 // Important special case: The caller has given up and just wants us to
263 // skip the rest of the file. Do this without recursing, since we can
264 // get here precisely because the caller detected too much recursion.
265 if (Toks.size() == 1 && Toks[0] == tok::eof &&
266 !HasFlagsSet(Flags, StopAtSemi) &&
267 !HasFlagsSet(Flags, StopAtCodeCompletion)) {
268 while (Tok.isNot(tok::eof))
273 switch (Tok.getKind()) {
275 // Ran out of tokens.
278 case tok::annot_pragma_openmp:
279 case tok::annot_pragma_openmp_end:
280 // Stop before an OpenMP pragma boundary.
281 case tok::annot_module_begin:
282 case tok::annot_module_end:
283 case tok::annot_module_include:
284 // Stop before we change submodules. They generally indicate a "good"
285 // place to pick up parsing again (except in the special case where
286 // we're trying to skip to EOF).
289 case tok::code_completion:
290 if (!HasFlagsSet(Flags, StopAtCodeCompletion))
291 handleUnexpectedCodeCompletionToken();
295 // Recursively skip properly-nested parens.
297 if (HasFlagsSet(Flags, StopAtCodeCompletion))
298 SkipUntil(tok::r_paren, StopAtCodeCompletion);
300 SkipUntil(tok::r_paren);
303 // Recursively skip properly-nested square brackets.
305 if (HasFlagsSet(Flags, StopAtCodeCompletion))
306 SkipUntil(tok::r_square, StopAtCodeCompletion);
308 SkipUntil(tok::r_square);
311 // Recursively skip properly-nested braces.
313 if (HasFlagsSet(Flags, StopAtCodeCompletion))
314 SkipUntil(tok::r_brace, StopAtCodeCompletion);
316 SkipUntil(tok::r_brace);
319 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
320 // Since the user wasn't looking for this token (if they were, it would
321 // already be handled), this isn't balanced. If there is a LHS token at a
322 // higher level, we will assume that this matches the unbalanced token
323 // and return it. Otherwise, this is a spurious RHS token, which we skip.
325 if (ParenCount && !isFirstTokenSkipped)
326 return false; // Matches something.
330 if (BracketCount && !isFirstTokenSkipped)
331 return false; // Matches something.
335 if (BraceCount && !isFirstTokenSkipped)
336 return false; // Matches something.
341 if (HasFlagsSet(Flags, StopAtSemi))
349 isFirstTokenSkipped = false;
353 //===----------------------------------------------------------------------===//
354 // Scope manipulation
355 //===----------------------------------------------------------------------===//
357 /// EnterScope - Start a new scope.
358 void Parser::EnterScope(unsigned ScopeFlags) {
359 if (NumCachedScopes) {
360 Scope *N = ScopeCache[--NumCachedScopes];
361 N->Init(getCurScope(), ScopeFlags);
362 Actions.CurScope = N;
364 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
368 /// ExitScope - Pop a scope off the scope stack.
369 void Parser::ExitScope() {
370 assert(getCurScope() && "Scope imbalance!");
372 // Inform the actions module that this scope is going away if there are any
374 Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
376 Scope *OldScope = getCurScope();
377 Actions.CurScope = OldScope->getParent();
379 if (NumCachedScopes == ScopeCacheSize)
382 ScopeCache[NumCachedScopes++] = OldScope;
385 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
386 /// this object does nothing.
387 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
389 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
391 OldFlags = CurScope->getFlags();
392 CurScope->setFlags(ScopeFlags);
396 /// Restore the flags for the current scope to what they were before this
397 /// object overrode them.
398 Parser::ParseScopeFlags::~ParseScopeFlags() {
400 CurScope->setFlags(OldFlags);
404 //===----------------------------------------------------------------------===//
405 // C99 6.9: External Definitions.
406 //===----------------------------------------------------------------------===//
409 // If we still have scopes active, delete the scope tree.
410 delete getCurScope();
411 Actions.CurScope = nullptr;
413 // Free the scope cache.
414 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
415 delete ScopeCache[i];
417 resetPragmaHandlers();
419 PP.removeCommentHandler(CommentSemaHandler.get());
421 PP.clearCodeCompletionHandler();
423 if (getLangOpts().DelayedTemplateParsing &&
424 !PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
425 // If an ASTConsumer parsed delay-parsed templates in their
426 // HandleTranslationUnit() method, TemplateIds created there were not
427 // guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
428 // ParseTopLevelDecl(). Destroy them here.
429 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
432 assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
435 /// Initialize - Warm up the parser.
437 void Parser::Initialize() {
438 // Create the translation unit scope. Install it as the current scope.
439 assert(getCurScope() == nullptr && "A scope is already active?");
440 EnterScope(Scope::DeclScope);
441 Actions.ActOnTranslationUnitScope(getCurScope());
443 // Initialization for Objective-C context sensitive keywords recognition.
444 // Referenced in Parser::ParseObjCTypeQualifierList.
445 if (getLangOpts().ObjC1) {
446 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
447 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
448 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
449 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
450 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
451 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
452 ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
453 ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
454 ObjCTypeQuals[objc_null_unspecified]
455 = &PP.getIdentifierTable().get("null_unspecified");
458 Ident_instancetype = nullptr;
459 Ident_final = nullptr;
460 Ident_sealed = nullptr;
461 Ident_override = nullptr;
462 Ident_GNU_final = nullptr;
464 Ident_super = &PP.getIdentifierTable().get("super");
466 Ident_vector = nullptr;
467 Ident_bool = nullptr;
468 Ident_pixel = nullptr;
469 if (getLangOpts().AltiVec || getLangOpts().ZVector) {
470 Ident_vector = &PP.getIdentifierTable().get("vector");
471 Ident_bool = &PP.getIdentifierTable().get("bool");
473 if (getLangOpts().AltiVec)
474 Ident_pixel = &PP.getIdentifierTable().get("pixel");
476 Ident_introduced = nullptr;
477 Ident_deprecated = nullptr;
478 Ident_obsoleted = nullptr;
479 Ident_unavailable = nullptr;
480 Ident_strict = nullptr;
481 Ident_replacement = nullptr;
483 Ident_language = Ident_defined_in = Ident_generated_declaration = nullptr;
485 Ident__except = nullptr;
487 Ident__exception_code = Ident__exception_info = nullptr;
488 Ident__abnormal_termination = Ident___exception_code = nullptr;
489 Ident___exception_info = Ident___abnormal_termination = nullptr;
490 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
491 Ident_AbnormalTermination = nullptr;
493 if(getLangOpts().Borland) {
494 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
495 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
496 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
497 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
498 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
499 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
500 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
501 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
502 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
504 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
505 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
506 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
507 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
508 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
509 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
510 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
511 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
512 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
515 Actions.Initialize();
517 // Prime the lexer look-ahead.
521 void Parser::LateTemplateParserCleanupCallback(void *P) {
522 // While this RAII helper doesn't bracket any actual work, the destructor will
523 // clean up annotations that were created during ActOnEndOfTranslationUnit
524 // when incremental processing is enabled.
525 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
528 bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result) {
529 Actions.ActOnStartOfTranslationUnit();
531 // C11 6.9p1 says translation units must have at least one top-level
532 // declaration. C++ doesn't have this restriction. We also don't want to
533 // complain if we have a precompiled header, although technically if the PCH
534 // is empty we should still emit the (pedantic) diagnostic.
535 bool NoTopLevelDecls = ParseTopLevelDecl(Result);
536 if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
537 !getLangOpts().CPlusPlus)
538 Diag(diag::ext_empty_translation_unit);
540 return NoTopLevelDecls;
543 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
544 /// action tells us to. This returns true if the EOF was encountered.
545 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
546 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
548 // Skip over the EOF token, flagging end of previous input for incremental
550 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
554 switch (Tok.getKind()) {
555 case tok::annot_pragma_unused:
556 HandlePragmaUnused();
560 if (NextToken().isNot(tok::kw_module))
564 Result = ParseModuleDecl();
567 case tok::annot_module_include:
568 Actions.ActOnModuleInclude(Tok.getLocation(),
569 reinterpret_cast<Module *>(
570 Tok.getAnnotationValue()));
571 ConsumeAnnotationToken();
574 case tok::annot_module_begin:
575 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
576 Tok.getAnnotationValue()));
577 ConsumeAnnotationToken();
580 case tok::annot_module_end:
581 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
582 Tok.getAnnotationValue()));
583 ConsumeAnnotationToken();
586 case tok::annot_pragma_attribute:
587 HandlePragmaAttribute();
591 // Late template parsing can begin.
592 if (getLangOpts().DelayedTemplateParsing)
593 Actions.SetLateTemplateParser(LateTemplateParserCallback,
594 PP.isIncrementalProcessingEnabled() ?
595 LateTemplateParserCleanupCallback : nullptr,
597 if (!PP.isIncrementalProcessingEnabled())
598 Actions.ActOnEndOfTranslationUnit();
599 //else don't tell Sema that we ended parsing: more input might come.
606 ParsedAttributesWithRange attrs(AttrFactory);
607 MaybeParseCXX11Attributes(attrs);
609 Result = ParseExternalDeclaration(attrs);
613 /// ParseExternalDeclaration:
615 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
616 /// function-definition
618 /// [GNU] asm-definition
619 /// [GNU] __extension__ external-declaration
620 /// [OBJC] objc-class-definition
621 /// [OBJC] objc-class-declaration
622 /// [OBJC] objc-alias-declaration
623 /// [OBJC] objc-protocol-definition
624 /// [OBJC] objc-method-definition
626 /// [C++] linkage-specification
627 /// [GNU] asm-definition:
628 /// simple-asm-expr ';'
629 /// [C++11] empty-declaration
630 /// [C++11] attribute-declaration
632 /// [C++11] empty-declaration:
635 /// [C++0x/GNU] 'extern' 'template' declaration
637 /// [Modules-TS] module-import-declaration
639 Parser::DeclGroupPtrTy
640 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
641 ParsingDeclSpec *DS) {
642 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
643 ParenBraceBracketBalancer BalancerRAIIObj(*this);
645 if (PP.isCodeCompletionReached()) {
650 Decl *SingleDecl = nullptr;
651 switch (Tok.getKind()) {
652 case tok::annot_pragma_vis:
653 HandlePragmaVisibility();
655 case tok::annot_pragma_pack:
658 case tok::annot_pragma_msstruct:
659 HandlePragmaMSStruct();
661 case tok::annot_pragma_align:
664 case tok::annot_pragma_weak:
667 case tok::annot_pragma_weakalias:
668 HandlePragmaWeakAlias();
670 case tok::annot_pragma_redefine_extname:
671 HandlePragmaRedefineExtname();
673 case tok::annot_pragma_fp_contract:
674 HandlePragmaFPContract();
676 case tok::annot_pragma_fp:
679 case tok::annot_pragma_opencl_extension:
680 HandlePragmaOpenCLExtension();
682 case tok::annot_pragma_openmp: {
683 AccessSpecifier AS = AS_none;
684 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
686 case tok::annot_pragma_ms_pointers_to_members:
687 HandlePragmaMSPointersToMembers();
689 case tok::annot_pragma_ms_vtordisp:
690 HandlePragmaMSVtorDisp();
692 case tok::annot_pragma_ms_pragma:
693 HandlePragmaMSPragma();
695 case tok::annot_pragma_dump:
699 // Either a C++11 empty-declaration or attribute-declaration.
700 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
703 ConsumeExtraSemi(OutsideFunction);
706 Diag(Tok, diag::err_extraneous_closing_brace);
710 Diag(Tok, diag::err_expected_external_declaration);
712 case tok::kw___extension__: {
713 // __extension__ silences extension warnings in the subexpression.
714 ExtensionRAIIObject O(Diags); // Use RAII to do this.
716 return ParseExternalDeclaration(attrs);
719 ProhibitAttributes(attrs);
721 SourceLocation StartLoc = Tok.getLocation();
722 SourceLocation EndLoc;
724 ExprResult Result(ParseSimpleAsm(&EndLoc));
726 // Check if GNU-style InlineAsm is disabled.
727 // Empty asm string is allowed because it will not introduce
728 // any assembly code.
729 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
730 const auto *SL = cast<StringLiteral>(Result.get());
731 if (!SL->getString().trim().empty())
732 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
735 ExpectAndConsume(tok::semi, diag::err_expected_after,
736 "top-level asm block");
738 if (Result.isInvalid())
740 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
744 return ParseObjCAtDirectives();
747 if (!getLangOpts().ObjC1) {
748 Diag(Tok, diag::err_expected_external_declaration);
752 SingleDecl = ParseObjCMethodDefinition();
754 case tok::code_completion:
755 if (CurParsedObjCImpl) {
756 // Code-complete Objective-C methods even without leading '-'/'+' prefix.
757 Actions.CodeCompleteObjCMethodDecl(getCurScope(),
758 /*IsInstanceMethod=*/None,
759 /*ReturnType=*/nullptr);
761 Actions.CodeCompleteOrdinaryName(
763 CurParsedObjCImpl ? Sema::PCC_ObjCImplementation : Sema::PCC_Namespace);
767 SingleDecl = ParseModuleImport(SourceLocation());
770 if (getLangOpts().ModulesTS) {
771 SingleDecl = ParseExportDeclaration();
774 // This must be 'export template'. Parse it so we can diagnose our lack
778 case tok::kw_namespace:
779 case tok::kw_typedef:
780 case tok::kw_template:
781 case tok::kw_static_assert:
782 case tok::kw__Static_assert:
783 // A function definition cannot start with any of these keywords.
785 SourceLocation DeclEnd;
786 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
790 // Parse (then ignore) 'static' prior to a template instantiation. This is
791 // a GCC extension that we intentionally do not support.
792 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
793 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
795 SourceLocation DeclEnd;
796 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
801 if (getLangOpts().CPlusPlus) {
802 tok::TokenKind NextKind = NextToken().getKind();
804 // Inline namespaces. Allowed as an extension even in C++03.
805 if (NextKind == tok::kw_namespace) {
806 SourceLocation DeclEnd;
807 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
810 // Parse (then ignore) 'inline' prior to a template instantiation. This is
811 // a GCC extension that we intentionally do not support.
812 if (NextKind == tok::kw_template) {
813 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
815 SourceLocation DeclEnd;
816 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
822 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
824 SourceLocation ExternLoc = ConsumeToken();
825 SourceLocation TemplateLoc = ConsumeToken();
826 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
827 diag::warn_cxx98_compat_extern_template :
828 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
829 SourceLocation DeclEnd;
830 return Actions.ConvertDeclToDeclGroup(
831 ParseExplicitInstantiation(Declarator::FileContext,
832 ExternLoc, TemplateLoc, DeclEnd));
836 case tok::kw___if_exists:
837 case tok::kw___if_not_exists:
838 ParseMicrosoftIfExistsExternalDeclaration();
842 Diag(Tok, diag::err_unexpected_module_decl);
843 SkipUntil(tok::semi);
848 if (Tok.isEditorPlaceholder()) {
852 // We can't tell whether this is a function-definition or declaration yet.
853 return ParseDeclarationOrFunctionDefinition(attrs, DS);
856 // This routine returns a DeclGroup, if the thing we parsed only contains a
857 // single decl, convert it now.
858 return Actions.ConvertDeclToDeclGroup(SingleDecl);
861 /// \brief Determine whether the current token, if it occurs after a
862 /// declarator, continues a declaration or declaration list.
863 bool Parser::isDeclarationAfterDeclarator() {
864 // Check for '= delete' or '= default'
865 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
866 const Token &KW = NextToken();
867 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
871 return Tok.is(tok::equal) || // int X()= -> not a function def
872 Tok.is(tok::comma) || // int X(), -> not a function def
873 Tok.is(tok::semi) || // int X(); -> not a function def
874 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
875 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
876 (getLangOpts().CPlusPlus &&
877 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
880 /// \brief Determine whether the current token, if it occurs after a
881 /// declarator, indicates the start of a function definition.
882 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
883 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
884 if (Tok.is(tok::l_brace)) // int X() {}
887 // Handle K&R C argument lists: int X(f) int f; {}
888 if (!getLangOpts().CPlusPlus &&
889 Declarator.getFunctionTypeInfo().isKNRPrototype())
890 return isDeclarationSpecifier();
892 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
893 const Token &KW = NextToken();
894 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
897 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
898 Tok.is(tok::kw_try); // X() try { ... }
901 /// Parse either a function-definition or a declaration. We can't tell which
902 /// we have until we read up to the compound-statement in function-definition.
903 /// TemplateParams, if non-NULL, provides the template parameters when we're
904 /// parsing a C++ template-declaration.
906 /// function-definition: [C99 6.9.1]
907 /// decl-specs declarator declaration-list[opt] compound-statement
908 /// [C90] function-definition: [C99 6.7.1] - implicit int result
909 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
911 /// declaration: [C99 6.7]
912 /// declaration-specifiers init-declarator-list[opt] ';'
913 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
914 /// [OMP] threadprivate-directive [TODO]
916 Parser::DeclGroupPtrTy
917 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
919 AccessSpecifier AS) {
920 MaybeParseMicrosoftAttributes(DS.getAttributes());
921 // Parse the common declaration-specifiers piece.
922 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
924 // If we had a free-standing type definition with a missing semicolon, we
925 // may get this far before the problem becomes obvious.
926 if (DS.hasTagDefinition() &&
927 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
930 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
931 // declaration-specifiers init-declarator-list[opt] ';'
932 if (Tok.is(tok::semi)) {
933 ProhibitAttributes(attrs);
935 RecordDecl *AnonRecord = nullptr;
936 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
938 DS.complete(TheDecl);
939 if (getLangOpts().OpenCL)
940 Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
942 Decl* decls[] = {AnonRecord, TheDecl};
943 return Actions.BuildDeclaratorGroup(decls);
945 return Actions.ConvertDeclToDeclGroup(TheDecl);
948 DS.takeAttributesFrom(attrs);
950 // ObjC2 allows prefix attributes on class interfaces and protocols.
951 // FIXME: This still needs better diagnostics. We should only accept
952 // attributes here, no types, etc.
953 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
954 SourceLocation AtLoc = ConsumeToken(); // the "@"
955 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
956 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
957 Diag(Tok, diag::err_objc_unexpected_attr);
958 SkipUntil(tok::semi); // FIXME: better skip?
964 const char *PrevSpec = nullptr;
966 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
967 Actions.getASTContext().getPrintingPolicy()))
968 Diag(AtLoc, DiagID) << PrevSpec;
970 if (Tok.isObjCAtKeyword(tok::objc_protocol))
971 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
973 return Actions.ConvertDeclToDeclGroup(
974 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
977 // If the declspec consisted only of 'extern' and we have a string
978 // literal following it, this must be a C++ linkage specifier like
980 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
981 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
982 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
983 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
984 return Actions.ConvertDeclToDeclGroup(TheDecl);
987 return ParseDeclGroup(DS, Declarator::FileContext);
990 Parser::DeclGroupPtrTy
991 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
993 AccessSpecifier AS) {
995 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
997 ParsingDeclSpec PDS(*this);
998 // Must temporarily exit the objective-c container scope for
999 // parsing c constructs and re-enter objc container scope
1001 ObjCDeclContextSwitch ObjCDC(*this);
1003 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
1007 /// ParseFunctionDefinition - We parsed and verified that the specified
1008 /// Declarator is well formed. If this is a K&R-style function, read the
1009 /// parameters declaration-list, then start the compound-statement.
1011 /// function-definition: [C99 6.9.1]
1012 /// decl-specs declarator declaration-list[opt] compound-statement
1013 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1014 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1015 /// [C++] function-definition: [C++ 8.4]
1016 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1018 /// [C++] function-definition: [C++ 8.4]
1019 /// decl-specifier-seq[opt] declarator function-try-block
1021 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1022 const ParsedTemplateInfo &TemplateInfo,
1023 LateParsedAttrList *LateParsedAttrs) {
1024 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1025 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1026 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1028 // If this is C90 and the declspecs were completely missing, fudge in an
1029 // implicit int. We do this here because this is the only place where
1030 // declaration-specifiers are completely optional in the grammar.
1031 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1032 const char *PrevSpec;
1034 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1035 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
1036 D.getIdentifierLoc(),
1039 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1042 // If this declaration was formed with a K&R-style identifier list for the
1043 // arguments, parse declarations for all of the args next.
1044 // int foo(a,b) int a; float b; {}
1045 if (FTI.isKNRPrototype())
1046 ParseKNRParamDeclarations(D);
1048 // We should have either an opening brace or, in a C++ constructor,
1049 // we may have a colon.
1050 if (Tok.isNot(tok::l_brace) &&
1051 (!getLangOpts().CPlusPlus ||
1052 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1053 Tok.isNot(tok::equal)))) {
1054 Diag(Tok, diag::err_expected_fn_body);
1056 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1057 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1059 // If we didn't find the '{', bail out.
1060 if (Tok.isNot(tok::l_brace))
1064 // Check to make sure that any normal attributes are allowed to be on
1065 // a definition. Late parsed attributes are checked at the end.
1066 if (Tok.isNot(tok::equal)) {
1067 AttributeList *DtorAttrs = D.getAttributes();
1069 if (DtorAttrs->isKnownToGCC() &&
1070 !DtorAttrs->isCXX11Attribute()) {
1071 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1072 << DtorAttrs->getName();
1074 DtorAttrs = DtorAttrs->getNext();
1078 // In delayed template parsing mode, for function template we consume the
1079 // tokens and store them for late parsing at the end of the translation unit.
1080 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1081 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1082 Actions.canDelayFunctionBody(D)) {
1083 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1085 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1086 Scope::CompoundStmtScope);
1087 Scope *ParentScope = getCurScope()->getParent();
1089 D.setFunctionDefinitionKind(FDK_Definition);
1090 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1091 TemplateParameterLists);
1093 D.getMutableDeclSpec().abort();
1095 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1096 trySkippingFunctionBody()) {
1098 return Actions.ActOnSkippedFunctionBody(DP);
1102 LexTemplateFunctionForLateParsing(Toks);
1105 FunctionDecl *FnD = DP->getAsFunction();
1106 Actions.CheckForFunctionRedefinition(FnD);
1107 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1111 else if (CurParsedObjCImpl &&
1112 !TemplateInfo.TemplateParams &&
1113 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1114 Tok.is(tok::colon)) &&
1115 Actions.CurContext->isTranslationUnit()) {
1116 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1117 Scope::CompoundStmtScope);
1118 Scope *ParentScope = getCurScope()->getParent();
1120 D.setFunctionDefinitionKind(FDK_Definition);
1121 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1122 MultiTemplateParamsArg());
1123 D.complete(FuncDecl);
1124 D.getMutableDeclSpec().abort();
1126 // Consume the tokens and store them for later parsing.
1127 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1128 CurParsedObjCImpl->HasCFunction = true;
1131 // FIXME: Should we really fall through here?
1134 // Enter a scope for the function body.
1135 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1136 Scope::CompoundStmtScope);
1138 // Tell the actions module that we have entered a function definition with the
1139 // specified Declarator for the function.
1140 Sema::SkipBodyInfo SkipBody;
1141 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1142 TemplateInfo.TemplateParams
1143 ? *TemplateInfo.TemplateParams
1144 : MultiTemplateParamsArg(),
1147 if (SkipBody.ShouldSkip) {
1152 // Break out of the ParsingDeclarator context before we parse the body.
1155 // Break out of the ParsingDeclSpec context, too. This const_cast is
1156 // safe because we're always the sole owner.
1157 D.getMutableDeclSpec().abort();
1159 if (TryConsumeToken(tok::equal)) {
1160 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1162 bool Delete = false;
1163 SourceLocation KWLoc;
1164 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1165 Diag(KWLoc, getLangOpts().CPlusPlus11
1166 ? diag::warn_cxx98_compat_defaulted_deleted_function
1167 : diag::ext_defaulted_deleted_function)
1169 Actions.SetDeclDeleted(Res, KWLoc);
1171 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1172 Diag(KWLoc, getLangOpts().CPlusPlus11
1173 ? diag::warn_cxx98_compat_defaulted_deleted_function
1174 : diag::ext_defaulted_deleted_function)
1175 << 0 /* defaulted */;
1176 Actions.SetDeclDefaulted(Res, KWLoc);
1178 llvm_unreachable("function definition after = not 'delete' or 'default'");
1181 if (Tok.is(tok::comma)) {
1182 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1184 SkipUntil(tok::semi);
1185 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1186 Delete ? "delete" : "default")) {
1187 SkipUntil(tok::semi);
1190 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1191 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1195 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1196 trySkippingFunctionBody()) {
1198 Actions.ActOnSkippedFunctionBody(Res);
1199 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1202 if (Tok.is(tok::kw_try))
1203 return ParseFunctionTryBlock(Res, BodyScope);
1205 // If we have a colon, then we're probably parsing a C++
1206 // ctor-initializer.
1207 if (Tok.is(tok::colon)) {
1208 ParseConstructorInitializer(Res);
1210 // Recover from error.
1211 if (!Tok.is(tok::l_brace)) {
1213 Actions.ActOnFinishFunctionBody(Res, nullptr);
1217 Actions.ActOnDefaultCtorInitializers(Res);
1219 // Late attributes are parsed in the same scope as the function body.
1220 if (LateParsedAttrs)
1221 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1223 return ParseFunctionStatementBody(Res, BodyScope);
1226 void Parser::SkipFunctionBody() {
1227 if (Tok.is(tok::equal)) {
1228 SkipUntil(tok::semi);
1232 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1233 if (IsFunctionTryBlock)
1236 CachedTokens Skipped;
1237 if (ConsumeAndStoreFunctionPrologue(Skipped))
1238 SkipMalformedDecl();
1240 SkipUntil(tok::r_brace);
1241 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1242 SkipUntil(tok::l_brace);
1243 SkipUntil(tok::r_brace);
1248 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1249 /// types for a function with a K&R-style identifier list for arguments.
1250 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1251 // We know that the top-level of this declarator is a function.
1252 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1254 // Enter function-declaration scope, limiting any declarators to the
1255 // function prototype scope, including parameter declarators.
1256 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1257 Scope::FunctionDeclarationScope | Scope::DeclScope);
1259 // Read all the argument declarations.
1260 while (isDeclarationSpecifier()) {
1261 SourceLocation DSStart = Tok.getLocation();
1263 // Parse the common declaration-specifiers piece.
1264 DeclSpec DS(AttrFactory);
1265 ParseDeclarationSpecifiers(DS);
1267 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1268 // least one declarator'.
1269 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1270 // the declarations though. It's trivial to ignore them, really hard to do
1271 // anything else with them.
1272 if (TryConsumeToken(tok::semi)) {
1273 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1277 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1279 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1280 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1281 Diag(DS.getStorageClassSpecLoc(),
1282 diag::err_invalid_storage_class_in_func_decl);
1283 DS.ClearStorageClassSpecs();
1285 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1286 Diag(DS.getThreadStorageClassSpecLoc(),
1287 diag::err_invalid_storage_class_in_func_decl);
1288 DS.ClearStorageClassSpecs();
1291 // Parse the first declarator attached to this declspec.
1292 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1293 ParseDeclarator(ParmDeclarator);
1295 // Handle the full declarator list.
1297 // If attributes are present, parse them.
1298 MaybeParseGNUAttributes(ParmDeclarator);
1300 // Ask the actions module to compute the type for this declarator.
1302 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1305 // A missing identifier has already been diagnosed.
1306 ParmDeclarator.getIdentifier()) {
1308 // Scan the argument list looking for the correct param to apply this
1310 for (unsigned i = 0; ; ++i) {
1311 // C99 6.9.1p6: those declarators shall declare only identifiers from
1312 // the identifier list.
1313 if (i == FTI.NumParams) {
1314 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1315 << ParmDeclarator.getIdentifier();
1319 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1320 // Reject redefinitions of parameters.
1321 if (FTI.Params[i].Param) {
1322 Diag(ParmDeclarator.getIdentifierLoc(),
1323 diag::err_param_redefinition)
1324 << ParmDeclarator.getIdentifier();
1326 FTI.Params[i].Param = Param;
1333 // If we don't have a comma, it is either the end of the list (a ';') or
1334 // an error, bail out.
1335 if (Tok.isNot(tok::comma))
1338 ParmDeclarator.clear();
1340 // Consume the comma.
1341 ParmDeclarator.setCommaLoc(ConsumeToken());
1343 // Parse the next declarator.
1344 ParseDeclarator(ParmDeclarator);
1347 // Consume ';' and continue parsing.
1348 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1351 // Otherwise recover by skipping to next semi or mandatory function body.
1352 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1354 TryConsumeToken(tok::semi);
1357 // The actions module must verify that all arguments were declared.
1358 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1362 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1363 /// allowed to be a wide string, and is not subject to character translation.
1365 /// [GNU] asm-string-literal:
1368 ExprResult Parser::ParseAsmStringLiteral() {
1369 if (!isTokenStringLiteral()) {
1370 Diag(Tok, diag::err_expected_string_literal)
1371 << /*Source='in...'*/0 << "'asm'";
1375 ExprResult AsmString(ParseStringLiteralExpression());
1376 if (!AsmString.isInvalid()) {
1377 const auto *SL = cast<StringLiteral>(AsmString.get());
1378 if (!SL->isAscii()) {
1379 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1381 << SL->getSourceRange();
1390 /// [GNU] simple-asm-expr:
1391 /// 'asm' '(' asm-string-literal ')'
1393 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1394 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1395 SourceLocation Loc = ConsumeToken();
1397 if (Tok.is(tok::kw_volatile)) {
1398 // Remove from the end of 'asm' to the end of 'volatile'.
1399 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1400 PP.getLocForEndOfToken(Tok.getLocation()));
1402 Diag(Tok, diag::warn_file_asm_volatile)
1403 << FixItHint::CreateRemoval(RemovalRange);
1407 BalancedDelimiterTracker T(*this, tok::l_paren);
1408 if (T.consumeOpen()) {
1409 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1413 ExprResult Result(ParseAsmStringLiteral());
1415 if (!Result.isInvalid()) {
1416 // Close the paren and get the location of the end bracket
1419 *EndLoc = T.getCloseLocation();
1420 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1422 *EndLoc = Tok.getLocation();
1429 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1430 /// cleanup pool so that it gets destroyed when parsing the current top level
1431 /// declaration is finished.
1432 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1433 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1434 TemplateIdAnnotation *
1435 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1439 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1440 // Push the current token back into the token stream (or revert it if it is
1441 // cached) and use an annotation scope token for current token.
1442 if (PP.isBacktrackEnabled())
1443 PP.RevertCachedTokens(1);
1446 Tok.setKind(tok::annot_cxxscope);
1447 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1448 Tok.setAnnotationRange(SS.getRange());
1450 // In case the tokens were cached, have Preprocessor replace them
1451 // with the annotation token. We don't need to do this if we've
1452 // just reverted back to a prior state.
1453 if (IsNewAnnotation)
1454 PP.AnnotateCachedTokens(Tok);
1457 /// \brief Attempt to classify the name at the current token position. This may
1458 /// form a type, scope or primary expression annotation, or replace the token
1459 /// with a typo-corrected keyword. This is only appropriate when the current
1460 /// name must refer to an entity which has already been declared.
1462 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1463 /// and might possibly have a dependent nested name specifier.
1464 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1465 /// no typo correction will be performed.
1466 Parser::AnnotatedNameKind
1467 Parser::TryAnnotateName(bool IsAddressOfOperand,
1468 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1469 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1471 const bool EnteringContext = false;
1472 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1475 if (getLangOpts().CPlusPlus &&
1476 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1479 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1480 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1482 return ANK_Unresolved;
1485 IdentifierInfo *Name = Tok.getIdentifierInfo();
1486 SourceLocation NameLoc = Tok.getLocation();
1488 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1489 // typo-correct to tentatively-declared identifiers.
1490 if (isTentativelyDeclared(Name)) {
1491 // Identifier has been tentatively declared, and thus cannot be resolved as
1492 // an expression. Fall back to annotating it as a type.
1493 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1495 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1498 Token Next = NextToken();
1500 // Look up and classify the identifier. We don't perform any typo-correction
1501 // after a scope specifier, because in general we can't recover from typos
1502 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1503 // jump back into scope specifier parsing).
1504 Sema::NameClassification Classification = Actions.ClassifyName(
1505 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1506 SS.isEmpty() ? std::move(CCC) : nullptr);
1508 switch (Classification.getKind()) {
1509 case Sema::NC_Error:
1512 case Sema::NC_Keyword:
1513 // The identifier was typo-corrected to a keyword.
1514 Tok.setIdentifierInfo(Name);
1515 Tok.setKind(Name->getTokenID());
1516 PP.TypoCorrectToken(Tok);
1517 if (SS.isNotEmpty())
1518 AnnotateScopeToken(SS, !WasScopeAnnotation);
1519 // We've "annotated" this as a keyword.
1522 case Sema::NC_Unknown:
1523 // It's not something we know about. Leave it unannotated.
1526 case Sema::NC_Type: {
1527 SourceLocation BeginLoc = NameLoc;
1528 if (SS.isNotEmpty())
1529 BeginLoc = SS.getBeginLoc();
1531 /// An Objective-C object type followed by '<' is a specialization of
1532 /// a parameterized class type or a protocol-qualified type.
1533 ParsedType Ty = Classification.getType();
1534 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1535 (Ty.get()->isObjCObjectType() ||
1536 Ty.get()->isObjCObjectPointerType())) {
1537 // Consume the name.
1538 SourceLocation IdentifierLoc = ConsumeToken();
1539 SourceLocation NewEndLoc;
1541 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1542 /*consumeLastToken=*/false,
1544 if (NewType.isUsable())
1546 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1550 Tok.setKind(tok::annot_typename);
1551 setTypeAnnotation(Tok, Ty);
1552 Tok.setAnnotationEndLoc(Tok.getLocation());
1553 Tok.setLocation(BeginLoc);
1554 PP.AnnotateCachedTokens(Tok);
1558 case Sema::NC_Expression:
1559 Tok.setKind(tok::annot_primary_expr);
1560 setExprAnnotation(Tok, Classification.getExpression());
1561 Tok.setAnnotationEndLoc(NameLoc);
1562 if (SS.isNotEmpty())
1563 Tok.setLocation(SS.getBeginLoc());
1564 PP.AnnotateCachedTokens(Tok);
1567 case Sema::NC_TypeTemplate:
1568 if (Next.isNot(tok::less)) {
1569 // This may be a type template being used as a template template argument.
1570 if (SS.isNotEmpty())
1571 AnnotateScopeToken(SS, !WasScopeAnnotation);
1572 return ANK_TemplateName;
1575 case Sema::NC_VarTemplate:
1576 case Sema::NC_FunctionTemplate: {
1577 // We have a type, variable or function template followed by '<'.
1580 Id.setIdentifier(Name, NameLoc);
1581 if (AnnotateTemplateIdToken(
1582 TemplateTy::make(Classification.getTemplateName()),
1583 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1588 case Sema::NC_NestedNameSpecifier:
1589 llvm_unreachable("already parsed nested name specifier");
1592 // Unable to classify the name, but maybe we can annotate a scope specifier.
1593 if (SS.isNotEmpty())
1594 AnnotateScopeToken(SS, !WasScopeAnnotation);
1595 return ANK_Unresolved;
1598 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1599 assert(Tok.isNot(tok::identifier));
1600 Diag(Tok, diag::ext_keyword_as_ident)
1601 << PP.getSpelling(Tok)
1604 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1605 Tok.setKind(tok::identifier);
1609 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1610 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1611 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1612 /// with a single annotation token representing the typename or C++ scope
1614 /// This simplifies handling of C++ scope specifiers and allows efficient
1615 /// backtracking without the need to re-parse and resolve nested-names and
1617 /// It will mainly be called when we expect to treat identifiers as typenames
1618 /// (if they are typenames). For example, in C we do not expect identifiers
1619 /// inside expressions to be treated as typenames so it will not be called
1620 /// for expressions in C.
1621 /// The benefit for C/ObjC is that a typename will be annotated and
1622 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1623 /// will not be called twice, once to check whether we have a declaration
1624 /// specifier, and another one to get the actual type inside
1625 /// ParseDeclarationSpecifiers).
1627 /// This returns true if an error occurred.
1629 /// Note that this routine emits an error if you call it with ::new or ::delete
1630 /// as the current tokens, so only call it in contexts where these are invalid.
1631 bool Parser::TryAnnotateTypeOrScopeToken() {
1632 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1633 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1634 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1635 Tok.is(tok::kw___super)) &&
1636 "Cannot be a type or scope token!");
1638 if (Tok.is(tok::kw_typename)) {
1639 // MSVC lets you do stuff like:
1640 // typename typedef T_::D D;
1642 // We will consume the typedef token here and put it back after we have
1643 // parsed the first identifier, transforming it into something more like:
1644 // typename T_::D typedef D;
1645 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1647 PP.Lex(TypedefToken);
1648 bool Result = TryAnnotateTypeOrScopeToken();
1652 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1656 // Parse a C++ typename-specifier, e.g., "typename T::type".
1658 // typename-specifier:
1659 // 'typename' '::' [opt] nested-name-specifier identifier
1660 // 'typename' '::' [opt] nested-name-specifier template [opt]
1661 // simple-template-id
1662 SourceLocation TypenameLoc = ConsumeToken();
1664 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1665 /*EnteringContext=*/false, nullptr,
1666 /*IsTypename*/ true))
1669 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1670 Tok.is(tok::annot_decltype)) {
1671 // Attempt to recover by skipping the invalid 'typename'
1672 if (Tok.is(tok::annot_decltype) ||
1673 (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1674 unsigned DiagID = diag::err_expected_qualified_after_typename;
1675 // MS compatibility: MSVC permits using known types with typename.
1676 // e.g. "typedef typename T* pointer_type"
1677 if (getLangOpts().MicrosoftExt)
1678 DiagID = diag::warn_expected_qualified_after_typename;
1679 Diag(Tok.getLocation(), DiagID);
1683 if (Tok.isEditorPlaceholder())
1686 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1691 if (Tok.is(tok::identifier)) {
1692 // FIXME: check whether the next token is '<', first!
1693 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1694 *Tok.getIdentifierInfo(),
1696 } else if (Tok.is(tok::annot_template_id)) {
1697 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1698 if (TemplateId->Kind != TNK_Type_template &&
1699 TemplateId->Kind != TNK_Dependent_template_name) {
1700 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1701 << Tok.getAnnotationRange();
1705 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1706 TemplateId->NumArgs);
1708 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1709 TemplateId->TemplateKWLoc,
1710 TemplateId->Template,
1712 TemplateId->TemplateNameLoc,
1713 TemplateId->LAngleLoc,
1715 TemplateId->RAngleLoc);
1717 Diag(Tok, diag::err_expected_type_name_after_typename)
1722 SourceLocation EndLoc = Tok.getLastLoc();
1723 Tok.setKind(tok::annot_typename);
1724 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1725 Tok.setAnnotationEndLoc(EndLoc);
1726 Tok.setLocation(TypenameLoc);
1727 PP.AnnotateCachedTokens(Tok);
1731 // Remembers whether the token was originally a scope annotation.
1732 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1735 if (getLangOpts().CPlusPlus)
1736 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
1739 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1742 /// \brief Try to annotate a type or scope token, having already parsed an
1743 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1744 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1745 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
1747 if (Tok.is(tok::identifier)) {
1748 // Determine whether the identifier is a type name.
1749 if (ParsedType Ty = Actions.getTypeName(
1750 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1751 false, NextToken().is(tok::period), nullptr,
1752 /*IsCtorOrDtorName=*/false,
1753 /*NonTrivialTypeSourceInfo*/ true,
1754 /*IsClassTemplateDeductionContext*/GreaterThanIsOperator)) {
1755 SourceLocation BeginLoc = Tok.getLocation();
1756 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1757 BeginLoc = SS.getBeginLoc();
1759 /// An Objective-C object type followed by '<' is a specialization of
1760 /// a parameterized class type or a protocol-qualified type.
1761 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1762 (Ty.get()->isObjCObjectType() ||
1763 Ty.get()->isObjCObjectPointerType())) {
1764 // Consume the name.
1765 SourceLocation IdentifierLoc = ConsumeToken();
1766 SourceLocation NewEndLoc;
1768 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1769 /*consumeLastToken=*/false,
1771 if (NewType.isUsable())
1773 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1777 // This is a typename. Replace the current token in-place with an
1778 // annotation type token.
1779 Tok.setKind(tok::annot_typename);
1780 setTypeAnnotation(Tok, Ty);
1781 Tok.setAnnotationEndLoc(Tok.getLocation());
1782 Tok.setLocation(BeginLoc);
1784 // In case the tokens were cached, have Preprocessor replace
1785 // them with the annotation token.
1786 PP.AnnotateCachedTokens(Tok);
1790 if (!getLangOpts().CPlusPlus) {
1791 // If we're in C, we can't have :: tokens at all (the lexer won't return
1792 // them). If the identifier is not a type, then it can't be scope either,
1797 // If this is a template-id, annotate with a template-id or type token.
1798 if (NextToken().is(tok::less)) {
1799 TemplateTy Template;
1800 UnqualifiedId TemplateName;
1801 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1802 bool MemberOfUnknownSpecialization;
1803 if (TemplateNameKind TNK = Actions.isTemplateName(
1805 /*hasTemplateKeyword=*/false, TemplateName,
1806 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1807 MemberOfUnknownSpecialization)) {
1808 // Consume the identifier.
1810 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1812 // If an unrecoverable error occurred, we need to return true here,
1813 // because the token stream is in a damaged state. We may not return
1814 // a valid identifier.
1820 // The current token, which is either an identifier or a
1821 // template-id, is not part of the annotation. Fall through to
1822 // push that token back into the stream and complete the C++ scope
1823 // specifier annotation.
1826 if (Tok.is(tok::annot_template_id)) {
1827 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1828 if (TemplateId->Kind == TNK_Type_template) {
1829 // A template-id that refers to a type was parsed into a
1830 // template-id annotation in a context where we weren't allowed
1831 // to produce a type annotation token. Update the template-id
1832 // annotation token to a type annotation token now.
1833 AnnotateTemplateIdTokenAsType();
1841 // A C++ scope specifier that isn't followed by a typename.
1842 AnnotateScopeToken(SS, IsNewScope);
1846 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1847 /// annotates C++ scope specifiers and template-ids. This returns
1848 /// true if there was an error that could not be recovered from.
1850 /// Note that this routine emits an error if you call it with ::new or ::delete
1851 /// as the current tokens, so only call it in contexts where these are invalid.
1852 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1853 assert(getLangOpts().CPlusPlus &&
1854 "Call sites of this function should be guarded by checking for C++");
1855 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1856 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1857 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1858 "Cannot be a type or scope token!");
1861 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1866 AnnotateScopeToken(SS, true);
1870 bool Parser::isTokenEqualOrEqualTypo() {
1871 tok::TokenKind Kind = Tok.getKind();
1875 case tok::ampequal: // &=
1876 case tok::starequal: // *=
1877 case tok::plusequal: // +=
1878 case tok::minusequal: // -=
1879 case tok::exclaimequal: // !=
1880 case tok::slashequal: // /=
1881 case tok::percentequal: // %=
1882 case tok::lessequal: // <=
1883 case tok::lesslessequal: // <<=
1884 case tok::greaterequal: // >=
1885 case tok::greatergreaterequal: // >>=
1886 case tok::caretequal: // ^=
1887 case tok::pipeequal: // |=
1888 case tok::equalequal: // ==
1889 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1891 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1898 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1899 assert(Tok.is(tok::code_completion));
1900 PrevTokLocation = Tok.getLocation();
1902 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1903 if (S->getFlags() & Scope::FnScope) {
1904 Actions.CodeCompleteOrdinaryName(getCurScope(),
1905 Sema::PCC_RecoveryInFunction);
1907 return PrevTokLocation;
1910 if (S->getFlags() & Scope::ClassScope) {
1911 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1913 return PrevTokLocation;
1917 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1919 return PrevTokLocation;
1922 // Code-completion pass-through functions
1924 void Parser::CodeCompleteDirective(bool InConditional) {
1925 Actions.CodeCompletePreprocessorDirective(InConditional);
1928 void Parser::CodeCompleteInConditionalExclusion() {
1929 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1932 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1933 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1936 void Parser::CodeCompletePreprocessorExpression() {
1937 Actions.CodeCompletePreprocessorExpression();
1940 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1941 MacroInfo *MacroInfo,
1942 unsigned ArgumentIndex) {
1943 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1947 void Parser::CodeCompleteNaturalLanguage() {
1948 Actions.CodeCompleteNaturalLanguage();
1951 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1952 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1953 "Expected '__if_exists' or '__if_not_exists'");
1954 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1955 Result.KeywordLoc = ConsumeToken();
1957 BalancedDelimiterTracker T(*this, tok::l_paren);
1958 if (T.consumeOpen()) {
1959 Diag(Tok, diag::err_expected_lparen_after)
1960 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1964 // Parse nested-name-specifier.
1965 if (getLangOpts().CPlusPlus)
1966 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1967 /*EnteringContext=*/false);
1969 // Check nested-name specifier.
1970 if (Result.SS.isInvalid()) {
1975 // Parse the unqualified-id.
1976 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1977 if (ParseUnqualifiedId(
1978 Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
1979 /*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
1980 TemplateKWLoc, Result.Name)) {
1985 if (T.consumeClose())
1988 // Check if the symbol exists.
1989 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1990 Result.IsIfExists, Result.SS,
1992 case Sema::IER_Exists:
1993 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1996 case Sema::IER_DoesNotExist:
1997 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
2000 case Sema::IER_Dependent:
2001 Result.Behavior = IEB_Dependent;
2004 case Sema::IER_Error:
2011 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2012 IfExistsCondition Result;
2013 if (ParseMicrosoftIfExistsCondition(Result))
2016 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2017 if (Braces.consumeOpen()) {
2018 Diag(Tok, diag::err_expected) << tok::l_brace;
2022 switch (Result.Behavior) {
2024 // Parse declarations below.
2028 llvm_unreachable("Cannot have a dependent external declaration");
2035 // Parse the declarations.
2036 // FIXME: Support module import within __if_exists?
2037 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2038 ParsedAttributesWithRange attrs(AttrFactory);
2039 MaybeParseCXX11Attributes(attrs);
2040 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2041 if (Result && !getCurScope()->getParent())
2042 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2044 Braces.consumeClose();
2047 /// Parse a C++ Modules TS module declaration, which appears at the beginning
2048 /// of a module interface, module partition, or module implementation file.
2050 /// module-declaration: [Modules TS + P0273R0 + P0629R0]
2051 /// 'export'[opt] 'module' 'partition'[opt]
2052 /// module-name attribute-specifier-seq[opt] ';'
2054 /// Note that 'partition' is a context-sensitive keyword.
2055 Parser::DeclGroupPtrTy Parser::ParseModuleDecl() {
2056 SourceLocation StartLoc = Tok.getLocation();
2058 Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
2059 ? Sema::ModuleDeclKind::Interface
2060 : Sema::ModuleDeclKind::Implementation;
2062 assert(Tok.is(tok::kw_module) && "not a module declaration");
2063 SourceLocation ModuleLoc = ConsumeToken();
2065 if (Tok.is(tok::identifier) && NextToken().is(tok::identifier) &&
2066 Tok.getIdentifierInfo()->isStr("partition")) {
2067 // If 'partition' is present, this must be a module interface unit.
2068 if (MDK != Sema::ModuleDeclKind::Interface)
2069 Diag(Tok.getLocation(), diag::err_module_implementation_partition)
2070 << FixItHint::CreateInsertion(ModuleLoc, "export ");
2071 MDK = Sema::ModuleDeclKind::Partition;
2075 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2076 if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2079 // We don't support any module attributes yet; just parse them and diagnose.
2080 ParsedAttributesWithRange Attrs(AttrFactory);
2081 MaybeParseCXX11Attributes(Attrs);
2082 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2084 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2086 return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path);
2089 /// Parse a module import declaration. This is essentially the same for
2090 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2091 /// and the trailing optional attributes (in C++).
2093 /// [ObjC] @import declaration:
2094 /// '@' 'import' module-name ';'
2095 /// [ModTS] module-import-declaration:
2096 /// 'import' module-name attribute-specifier-seq[opt] ';'
2097 Decl *Parser::ParseModuleImport(SourceLocation AtLoc) {
2098 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2099 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2100 "Improper start to module import");
2101 SourceLocation ImportLoc = ConsumeToken();
2102 SourceLocation StartLoc = AtLoc.isInvalid() ? ImportLoc : AtLoc;
2104 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2105 if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2108 ParsedAttributesWithRange Attrs(AttrFactory);
2109 MaybeParseCXX11Attributes(Attrs);
2110 // We don't support any module import attributes yet.
2111 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2113 if (PP.hadModuleLoaderFatalFailure()) {
2114 // With a fatal failure in the module loader, we abort parsing.
2119 DeclResult Import = Actions.ActOnModuleImport(StartLoc, ImportLoc, Path);
2120 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2121 if (Import.isInvalid())
2124 return Import.get();
2127 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2131 /// module-name-qualifier[opt] identifier
2132 /// module-name-qualifier:
2133 /// module-name-qualifier[opt] identifier '.'
2134 bool Parser::ParseModuleName(
2135 SourceLocation UseLoc,
2136 SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2138 // Parse the module path.
2140 if (!Tok.is(tok::identifier)) {
2141 if (Tok.is(tok::code_completion)) {
2142 Actions.CodeCompleteModuleImport(UseLoc, Path);
2147 Diag(Tok, diag::err_module_expected_ident) << IsImport;
2148 SkipUntil(tok::semi);
2152 // Record this part of the module path.
2153 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2156 if (Tok.isNot(tok::period))
2163 /// \brief Try recover parser when module annotation appears where it must not
2165 /// \returns false if the recover was successful and parsing may be continued, or
2166 /// true if parser must bail out to top level and handle the token there.
2167 bool Parser::parseMisplacedModuleImport() {
2169 switch (Tok.getKind()) {
2170 case tok::annot_module_end:
2171 // If we recovered from a misplaced module begin, we expect to hit a
2172 // misplaced module end too. Stay in the current context when this
2174 if (MisplacedModuleBeginCount) {
2175 --MisplacedModuleBeginCount;
2176 Actions.ActOnModuleEnd(Tok.getLocation(),
2177 reinterpret_cast<Module *>(
2178 Tok.getAnnotationValue()));
2179 ConsumeAnnotationToken();
2182 // Inform caller that recovery failed, the error must be handled at upper
2183 // level. This will generate the desired "missing '}' at end of module"
2184 // diagnostics on the way out.
2186 case tok::annot_module_begin:
2187 // Recover by entering the module (Sema will diagnose).
2188 Actions.ActOnModuleBegin(Tok.getLocation(),
2189 reinterpret_cast<Module *>(
2190 Tok.getAnnotationValue()));
2191 ConsumeAnnotationToken();
2192 ++MisplacedModuleBeginCount;
2194 case tok::annot_module_include:
2195 // Module import found where it should not be, for instance, inside a
2196 // namespace. Recover by importing the module.
2197 Actions.ActOnModuleInclude(Tok.getLocation(),
2198 reinterpret_cast<Module *>(
2199 Tok.getAnnotationValue()));
2200 ConsumeAnnotationToken();
2201 // If there is another module import, process it.
2210 bool BalancedDelimiterTracker::diagnoseOverflow() {
2211 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2212 << P.getLangOpts().BracketDepth;
2213 P.Diag(P.Tok, diag::note_bracket_depth);
2218 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2220 tok::TokenKind SkipToTok) {
2221 LOpen = P.Tok.getLocation();
2222 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2223 if (SkipToTok != tok::unknown)
2224 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2228 if (getDepth() < MaxDepth)
2231 return diagnoseOverflow();
2234 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2235 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2237 if (P.Tok.is(tok::annot_module_end))
2238 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2240 P.Diag(P.Tok, diag::err_expected) << Close;
2241 P.Diag(LOpen, diag::note_matching) << Kind;
2243 // If we're not already at some kind of closing bracket, skip to our closing
2245 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2246 P.Tok.isNot(tok::r_square) &&
2247 P.SkipUntil(Close, FinalToken,
2248 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2250 LClose = P.ConsumeAnyToken();
2254 void BalancedDelimiterTracker::skipToEnd() {
2255 P.SkipUntil(Close, Parser::StopBeforeMatch);