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 Result = ParseModuleImport(SourceLocation());
564 if (NextToken().isNot(tok::kw_module))
568 Result = ParseModuleDecl();
571 case tok::annot_module_include:
572 Actions.ActOnModuleInclude(Tok.getLocation(),
573 reinterpret_cast<Module *>(
574 Tok.getAnnotationValue()));
575 ConsumeAnnotationToken();
578 case tok::annot_module_begin:
579 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
580 Tok.getAnnotationValue()));
581 ConsumeAnnotationToken();
584 case tok::annot_module_end:
585 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
586 Tok.getAnnotationValue()));
587 ConsumeAnnotationToken();
590 case tok::annot_pragma_attribute:
591 HandlePragmaAttribute();
595 // Late template parsing can begin.
596 if (getLangOpts().DelayedTemplateParsing)
597 Actions.SetLateTemplateParser(LateTemplateParserCallback,
598 PP.isIncrementalProcessingEnabled() ?
599 LateTemplateParserCleanupCallback : nullptr,
601 if (!PP.isIncrementalProcessingEnabled())
602 Actions.ActOnEndOfTranslationUnit();
603 //else don't tell Sema that we ended parsing: more input might come.
610 ParsedAttributesWithRange attrs(AttrFactory);
611 MaybeParseCXX11Attributes(attrs);
613 Result = ParseExternalDeclaration(attrs);
617 /// ParseExternalDeclaration:
619 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
620 /// function-definition
622 /// [GNU] asm-definition
623 /// [GNU] __extension__ external-declaration
624 /// [OBJC] objc-class-definition
625 /// [OBJC] objc-class-declaration
626 /// [OBJC] objc-alias-declaration
627 /// [OBJC] objc-protocol-definition
628 /// [OBJC] objc-method-definition
630 /// [C++] linkage-specification
631 /// [GNU] asm-definition:
632 /// simple-asm-expr ';'
633 /// [C++11] empty-declaration
634 /// [C++11] attribute-declaration
636 /// [C++11] empty-declaration:
639 /// [C++0x/GNU] 'extern' 'template' declaration
640 Parser::DeclGroupPtrTy
641 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
642 ParsingDeclSpec *DS) {
643 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
644 ParenBraceBracketBalancer BalancerRAIIObj(*this);
646 if (PP.isCodeCompletionReached()) {
651 Decl *SingleDecl = nullptr;
652 switch (Tok.getKind()) {
653 case tok::annot_pragma_vis:
654 HandlePragmaVisibility();
656 case tok::annot_pragma_pack:
659 case tok::annot_pragma_msstruct:
660 HandlePragmaMSStruct();
662 case tok::annot_pragma_align:
665 case tok::annot_pragma_weak:
668 case tok::annot_pragma_weakalias:
669 HandlePragmaWeakAlias();
671 case tok::annot_pragma_redefine_extname:
672 HandlePragmaRedefineExtname();
674 case tok::annot_pragma_fp_contract:
675 HandlePragmaFPContract();
677 case tok::annot_pragma_fp:
680 case tok::annot_pragma_opencl_extension:
681 HandlePragmaOpenCLExtension();
683 case tok::annot_pragma_openmp: {
684 AccessSpecifier AS = AS_none;
685 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
687 case tok::annot_pragma_ms_pointers_to_members:
688 HandlePragmaMSPointersToMembers();
690 case tok::annot_pragma_ms_vtordisp:
691 HandlePragmaMSVtorDisp();
693 case tok::annot_pragma_ms_pragma:
694 HandlePragmaMSPragma();
696 case tok::annot_pragma_dump:
700 // Either a C++11 empty-declaration or attribute-declaration.
701 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
704 ConsumeExtraSemi(OutsideFunction);
707 Diag(Tok, diag::err_extraneous_closing_brace);
711 Diag(Tok, diag::err_expected_external_declaration);
713 case tok::kw___extension__: {
714 // __extension__ silences extension warnings in the subexpression.
715 ExtensionRAIIObject O(Diags); // Use RAII to do this.
717 return ParseExternalDeclaration(attrs);
720 ProhibitAttributes(attrs);
722 SourceLocation StartLoc = Tok.getLocation();
723 SourceLocation EndLoc;
725 ExprResult Result(ParseSimpleAsm(&EndLoc));
727 // Check if GNU-style InlineAsm is disabled.
728 // Empty asm string is allowed because it will not introduce
729 // any assembly code.
730 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
731 const auto *SL = cast<StringLiteral>(Result.get());
732 if (!SL->getString().trim().empty())
733 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
736 ExpectAndConsume(tok::semi, diag::err_expected_after,
737 "top-level asm block");
739 if (Result.isInvalid())
741 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
745 return ParseObjCAtDirectives();
748 if (!getLangOpts().ObjC1) {
749 Diag(Tok, diag::err_expected_external_declaration);
753 SingleDecl = ParseObjCMethodDefinition();
755 case tok::code_completion:
756 Actions.CodeCompleteOrdinaryName(getCurScope(),
757 CurParsedObjCImpl? Sema::PCC_ObjCImplementation
758 : Sema::PCC_Namespace);
762 if (getLangOpts().ModulesTS) {
763 SingleDecl = ParseExportDeclaration();
766 // This must be 'export template'. Parse it so we can diagnose our lack
770 case tok::kw_namespace:
771 case tok::kw_typedef:
772 case tok::kw_template:
773 case tok::kw_static_assert:
774 case tok::kw__Static_assert:
775 // A function definition cannot start with any of these keywords.
777 SourceLocation DeclEnd;
778 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
782 // Parse (then ignore) 'static' prior to a template instantiation. This is
783 // a GCC extension that we intentionally do not support.
784 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
785 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
787 SourceLocation DeclEnd;
788 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
793 if (getLangOpts().CPlusPlus) {
794 tok::TokenKind NextKind = NextToken().getKind();
796 // Inline namespaces. Allowed as an extension even in C++03.
797 if (NextKind == tok::kw_namespace) {
798 SourceLocation DeclEnd;
799 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
802 // Parse (then ignore) 'inline' prior to a template instantiation. This is
803 // a GCC extension that we intentionally do not support.
804 if (NextKind == tok::kw_template) {
805 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
807 SourceLocation DeclEnd;
808 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
814 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
816 SourceLocation ExternLoc = ConsumeToken();
817 SourceLocation TemplateLoc = ConsumeToken();
818 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
819 diag::warn_cxx98_compat_extern_template :
820 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
821 SourceLocation DeclEnd;
822 return Actions.ConvertDeclToDeclGroup(
823 ParseExplicitInstantiation(Declarator::FileContext,
824 ExternLoc, TemplateLoc, DeclEnd));
828 case tok::kw___if_exists:
829 case tok::kw___if_not_exists:
830 ParseMicrosoftIfExistsExternalDeclaration();
834 Diag(Tok, diag::err_unexpected_module_decl);
835 SkipUntil(tok::semi);
840 if (Tok.isEditorPlaceholder()) {
844 // We can't tell whether this is a function-definition or declaration yet.
845 return ParseDeclarationOrFunctionDefinition(attrs, DS);
848 // This routine returns a DeclGroup, if the thing we parsed only contains a
849 // single decl, convert it now.
850 return Actions.ConvertDeclToDeclGroup(SingleDecl);
853 /// \brief Determine whether the current token, if it occurs after a
854 /// declarator, continues a declaration or declaration list.
855 bool Parser::isDeclarationAfterDeclarator() {
856 // Check for '= delete' or '= default'
857 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
858 const Token &KW = NextToken();
859 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
863 return Tok.is(tok::equal) || // int X()= -> not a function def
864 Tok.is(tok::comma) || // int X(), -> not a function def
865 Tok.is(tok::semi) || // int X(); -> not a function def
866 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
867 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
868 (getLangOpts().CPlusPlus &&
869 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
872 /// \brief Determine whether the current token, if it occurs after a
873 /// declarator, indicates the start of a function definition.
874 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
875 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
876 if (Tok.is(tok::l_brace)) // int X() {}
879 // Handle K&R C argument lists: int X(f) int f; {}
880 if (!getLangOpts().CPlusPlus &&
881 Declarator.getFunctionTypeInfo().isKNRPrototype())
882 return isDeclarationSpecifier();
884 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
885 const Token &KW = NextToken();
886 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
889 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
890 Tok.is(tok::kw_try); // X() try { ... }
893 /// Parse either a function-definition or a declaration. We can't tell which
894 /// we have until we read up to the compound-statement in function-definition.
895 /// TemplateParams, if non-NULL, provides the template parameters when we're
896 /// parsing a C++ template-declaration.
898 /// function-definition: [C99 6.9.1]
899 /// decl-specs declarator declaration-list[opt] compound-statement
900 /// [C90] function-definition: [C99 6.7.1] - implicit int result
901 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
903 /// declaration: [C99 6.7]
904 /// declaration-specifiers init-declarator-list[opt] ';'
905 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
906 /// [OMP] threadprivate-directive [TODO]
908 Parser::DeclGroupPtrTy
909 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
911 AccessSpecifier AS) {
912 MaybeParseMicrosoftAttributes(DS.getAttributes());
913 // Parse the common declaration-specifiers piece.
914 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
916 // If we had a free-standing type definition with a missing semicolon, we
917 // may get this far before the problem becomes obvious.
918 if (DS.hasTagDefinition() &&
919 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
922 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
923 // declaration-specifiers init-declarator-list[opt] ';'
924 if (Tok.is(tok::semi)) {
925 ProhibitAttributes(attrs);
927 RecordDecl *AnonRecord = nullptr;
928 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
930 DS.complete(TheDecl);
931 if (getLangOpts().OpenCL)
932 Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
934 Decl* decls[] = {AnonRecord, TheDecl};
935 return Actions.BuildDeclaratorGroup(decls);
937 return Actions.ConvertDeclToDeclGroup(TheDecl);
940 DS.takeAttributesFrom(attrs);
942 // ObjC2 allows prefix attributes on class interfaces and protocols.
943 // FIXME: This still needs better diagnostics. We should only accept
944 // attributes here, no types, etc.
945 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
946 SourceLocation AtLoc = ConsumeToken(); // the "@"
947 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
948 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
949 Diag(Tok, diag::err_objc_unexpected_attr);
950 SkipUntil(tok::semi); // FIXME: better skip?
956 const char *PrevSpec = nullptr;
958 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
959 Actions.getASTContext().getPrintingPolicy()))
960 Diag(AtLoc, DiagID) << PrevSpec;
962 if (Tok.isObjCAtKeyword(tok::objc_protocol))
963 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
965 return Actions.ConvertDeclToDeclGroup(
966 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
969 // If the declspec consisted only of 'extern' and we have a string
970 // literal following it, this must be a C++ linkage specifier like
972 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
973 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
974 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
975 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
976 return Actions.ConvertDeclToDeclGroup(TheDecl);
979 return ParseDeclGroup(DS, Declarator::FileContext);
982 Parser::DeclGroupPtrTy
983 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
985 AccessSpecifier AS) {
987 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
989 ParsingDeclSpec PDS(*this);
990 // Must temporarily exit the objective-c container scope for
991 // parsing c constructs and re-enter objc container scope
993 ObjCDeclContextSwitch ObjCDC(*this);
995 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
999 /// ParseFunctionDefinition - We parsed and verified that the specified
1000 /// Declarator is well formed. If this is a K&R-style function, read the
1001 /// parameters declaration-list, then start the compound-statement.
1003 /// function-definition: [C99 6.9.1]
1004 /// decl-specs declarator declaration-list[opt] compound-statement
1005 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1006 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1007 /// [C++] function-definition: [C++ 8.4]
1008 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1010 /// [C++] function-definition: [C++ 8.4]
1011 /// decl-specifier-seq[opt] declarator function-try-block
1013 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1014 const ParsedTemplateInfo &TemplateInfo,
1015 LateParsedAttrList *LateParsedAttrs) {
1016 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1017 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1018 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1020 // If this is C90 and the declspecs were completely missing, fudge in an
1021 // implicit int. We do this here because this is the only place where
1022 // declaration-specifiers are completely optional in the grammar.
1023 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1024 const char *PrevSpec;
1026 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1027 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
1028 D.getIdentifierLoc(),
1031 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1034 // If this declaration was formed with a K&R-style identifier list for the
1035 // arguments, parse declarations for all of the args next.
1036 // int foo(a,b) int a; float b; {}
1037 if (FTI.isKNRPrototype())
1038 ParseKNRParamDeclarations(D);
1040 // We should have either an opening brace or, in a C++ constructor,
1041 // we may have a colon.
1042 if (Tok.isNot(tok::l_brace) &&
1043 (!getLangOpts().CPlusPlus ||
1044 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1045 Tok.isNot(tok::equal)))) {
1046 Diag(Tok, diag::err_expected_fn_body);
1048 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1049 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1051 // If we didn't find the '{', bail out.
1052 if (Tok.isNot(tok::l_brace))
1056 // Check to make sure that any normal attributes are allowed to be on
1057 // a definition. Late parsed attributes are checked at the end.
1058 if (Tok.isNot(tok::equal)) {
1059 AttributeList *DtorAttrs = D.getAttributes();
1061 if (DtorAttrs->isKnownToGCC() &&
1062 !DtorAttrs->isCXX11Attribute()) {
1063 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1064 << DtorAttrs->getName();
1066 DtorAttrs = DtorAttrs->getNext();
1070 // In delayed template parsing mode, for function template we consume the
1071 // tokens and store them for late parsing at the end of the translation unit.
1072 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1073 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1074 Actions.canDelayFunctionBody(D)) {
1075 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1077 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1078 Scope *ParentScope = getCurScope()->getParent();
1080 D.setFunctionDefinitionKind(FDK_Definition);
1081 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1082 TemplateParameterLists);
1084 D.getMutableDeclSpec().abort();
1086 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1087 trySkippingFunctionBody()) {
1089 return Actions.ActOnSkippedFunctionBody(DP);
1093 LexTemplateFunctionForLateParsing(Toks);
1096 FunctionDecl *FnD = DP->getAsFunction();
1097 Actions.CheckForFunctionRedefinition(FnD);
1098 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1102 else if (CurParsedObjCImpl &&
1103 !TemplateInfo.TemplateParams &&
1104 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1105 Tok.is(tok::colon)) &&
1106 Actions.CurContext->isTranslationUnit()) {
1107 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1108 Scope *ParentScope = getCurScope()->getParent();
1110 D.setFunctionDefinitionKind(FDK_Definition);
1111 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1112 MultiTemplateParamsArg());
1113 D.complete(FuncDecl);
1114 D.getMutableDeclSpec().abort();
1116 // Consume the tokens and store them for later parsing.
1117 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1118 CurParsedObjCImpl->HasCFunction = true;
1121 // FIXME: Should we really fall through here?
1124 // Enter a scope for the function body.
1125 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1127 // Tell the actions module that we have entered a function definition with the
1128 // specified Declarator for the function.
1129 Sema::SkipBodyInfo SkipBody;
1130 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1131 TemplateInfo.TemplateParams
1132 ? *TemplateInfo.TemplateParams
1133 : MultiTemplateParamsArg(),
1136 if (SkipBody.ShouldSkip) {
1141 // Break out of the ParsingDeclarator context before we parse the body.
1144 // Break out of the ParsingDeclSpec context, too. This const_cast is
1145 // safe because we're always the sole owner.
1146 D.getMutableDeclSpec().abort();
1148 if (TryConsumeToken(tok::equal)) {
1149 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1151 bool Delete = false;
1152 SourceLocation KWLoc;
1153 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1154 Diag(KWLoc, getLangOpts().CPlusPlus11
1155 ? diag::warn_cxx98_compat_defaulted_deleted_function
1156 : diag::ext_defaulted_deleted_function)
1158 Actions.SetDeclDeleted(Res, KWLoc);
1160 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1161 Diag(KWLoc, getLangOpts().CPlusPlus11
1162 ? diag::warn_cxx98_compat_defaulted_deleted_function
1163 : diag::ext_defaulted_deleted_function)
1164 << 0 /* defaulted */;
1165 Actions.SetDeclDefaulted(Res, KWLoc);
1167 llvm_unreachable("function definition after = not 'delete' or 'default'");
1170 if (Tok.is(tok::comma)) {
1171 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1173 SkipUntil(tok::semi);
1174 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1175 Delete ? "delete" : "default")) {
1176 SkipUntil(tok::semi);
1179 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1180 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1184 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1185 trySkippingFunctionBody()) {
1187 Actions.ActOnSkippedFunctionBody(Res);
1188 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1191 if (Tok.is(tok::kw_try))
1192 return ParseFunctionTryBlock(Res, BodyScope);
1194 // If we have a colon, then we're probably parsing a C++
1195 // ctor-initializer.
1196 if (Tok.is(tok::colon)) {
1197 ParseConstructorInitializer(Res);
1199 // Recover from error.
1200 if (!Tok.is(tok::l_brace)) {
1202 Actions.ActOnFinishFunctionBody(Res, nullptr);
1206 Actions.ActOnDefaultCtorInitializers(Res);
1208 // Late attributes are parsed in the same scope as the function body.
1209 if (LateParsedAttrs)
1210 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1212 return ParseFunctionStatementBody(Res, BodyScope);
1215 void Parser::SkipFunctionBody() {
1216 if (Tok.is(tok::equal)) {
1217 SkipUntil(tok::semi);
1221 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1222 if (IsFunctionTryBlock)
1225 CachedTokens Skipped;
1226 if (ConsumeAndStoreFunctionPrologue(Skipped))
1227 SkipMalformedDecl();
1229 SkipUntil(tok::r_brace);
1230 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1231 SkipUntil(tok::l_brace);
1232 SkipUntil(tok::r_brace);
1237 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1238 /// types for a function with a K&R-style identifier list for arguments.
1239 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1240 // We know that the top-level of this declarator is a function.
1241 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1243 // Enter function-declaration scope, limiting any declarators to the
1244 // function prototype scope, including parameter declarators.
1245 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1246 Scope::FunctionDeclarationScope | Scope::DeclScope);
1248 // Read all the argument declarations.
1249 while (isDeclarationSpecifier()) {
1250 SourceLocation DSStart = Tok.getLocation();
1252 // Parse the common declaration-specifiers piece.
1253 DeclSpec DS(AttrFactory);
1254 ParseDeclarationSpecifiers(DS);
1256 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1257 // least one declarator'.
1258 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1259 // the declarations though. It's trivial to ignore them, really hard to do
1260 // anything else with them.
1261 if (TryConsumeToken(tok::semi)) {
1262 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1266 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1268 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1269 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1270 Diag(DS.getStorageClassSpecLoc(),
1271 diag::err_invalid_storage_class_in_func_decl);
1272 DS.ClearStorageClassSpecs();
1274 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1275 Diag(DS.getThreadStorageClassSpecLoc(),
1276 diag::err_invalid_storage_class_in_func_decl);
1277 DS.ClearStorageClassSpecs();
1280 // Parse the first declarator attached to this declspec.
1281 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1282 ParseDeclarator(ParmDeclarator);
1284 // Handle the full declarator list.
1286 // If attributes are present, parse them.
1287 MaybeParseGNUAttributes(ParmDeclarator);
1289 // Ask the actions module to compute the type for this declarator.
1291 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1294 // A missing identifier has already been diagnosed.
1295 ParmDeclarator.getIdentifier()) {
1297 // Scan the argument list looking for the correct param to apply this
1299 for (unsigned i = 0; ; ++i) {
1300 // C99 6.9.1p6: those declarators shall declare only identifiers from
1301 // the identifier list.
1302 if (i == FTI.NumParams) {
1303 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1304 << ParmDeclarator.getIdentifier();
1308 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1309 // Reject redefinitions of parameters.
1310 if (FTI.Params[i].Param) {
1311 Diag(ParmDeclarator.getIdentifierLoc(),
1312 diag::err_param_redefinition)
1313 << ParmDeclarator.getIdentifier();
1315 FTI.Params[i].Param = Param;
1322 // If we don't have a comma, it is either the end of the list (a ';') or
1323 // an error, bail out.
1324 if (Tok.isNot(tok::comma))
1327 ParmDeclarator.clear();
1329 // Consume the comma.
1330 ParmDeclarator.setCommaLoc(ConsumeToken());
1332 // Parse the next declarator.
1333 ParseDeclarator(ParmDeclarator);
1336 // Consume ';' and continue parsing.
1337 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1340 // Otherwise recover by skipping to next semi or mandatory function body.
1341 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1343 TryConsumeToken(tok::semi);
1346 // The actions module must verify that all arguments were declared.
1347 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1351 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1352 /// allowed to be a wide string, and is not subject to character translation.
1354 /// [GNU] asm-string-literal:
1357 ExprResult Parser::ParseAsmStringLiteral() {
1358 if (!isTokenStringLiteral()) {
1359 Diag(Tok, diag::err_expected_string_literal)
1360 << /*Source='in...'*/0 << "'asm'";
1364 ExprResult AsmString(ParseStringLiteralExpression());
1365 if (!AsmString.isInvalid()) {
1366 const auto *SL = cast<StringLiteral>(AsmString.get());
1367 if (!SL->isAscii()) {
1368 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1370 << SL->getSourceRange();
1379 /// [GNU] simple-asm-expr:
1380 /// 'asm' '(' asm-string-literal ')'
1382 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1383 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1384 SourceLocation Loc = ConsumeToken();
1386 if (Tok.is(tok::kw_volatile)) {
1387 // Remove from the end of 'asm' to the end of 'volatile'.
1388 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1389 PP.getLocForEndOfToken(Tok.getLocation()));
1391 Diag(Tok, diag::warn_file_asm_volatile)
1392 << FixItHint::CreateRemoval(RemovalRange);
1396 BalancedDelimiterTracker T(*this, tok::l_paren);
1397 if (T.consumeOpen()) {
1398 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1402 ExprResult Result(ParseAsmStringLiteral());
1404 if (!Result.isInvalid()) {
1405 // Close the paren and get the location of the end bracket
1408 *EndLoc = T.getCloseLocation();
1409 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1411 *EndLoc = Tok.getLocation();
1418 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1419 /// cleanup pool so that it gets destroyed when parsing the current top level
1420 /// declaration is finished.
1421 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1422 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1423 TemplateIdAnnotation *
1424 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1428 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1429 // Push the current token back into the token stream (or revert it if it is
1430 // cached) and use an annotation scope token for current token.
1431 if (PP.isBacktrackEnabled())
1432 PP.RevertCachedTokens(1);
1435 Tok.setKind(tok::annot_cxxscope);
1436 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1437 Tok.setAnnotationRange(SS.getRange());
1439 // In case the tokens were cached, have Preprocessor replace them
1440 // with the annotation token. We don't need to do this if we've
1441 // just reverted back to a prior state.
1442 if (IsNewAnnotation)
1443 PP.AnnotateCachedTokens(Tok);
1446 /// \brief Attempt to classify the name at the current token position. This may
1447 /// form a type, scope or primary expression annotation, or replace the token
1448 /// with a typo-corrected keyword. This is only appropriate when the current
1449 /// name must refer to an entity which has already been declared.
1451 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1452 /// and might possibly have a dependent nested name specifier.
1453 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1454 /// no typo correction will be performed.
1455 Parser::AnnotatedNameKind
1456 Parser::TryAnnotateName(bool IsAddressOfOperand,
1457 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1458 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1460 const bool EnteringContext = false;
1461 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1464 if (getLangOpts().CPlusPlus &&
1465 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1468 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1469 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1471 return ANK_Unresolved;
1474 IdentifierInfo *Name = Tok.getIdentifierInfo();
1475 SourceLocation NameLoc = Tok.getLocation();
1477 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1478 // typo-correct to tentatively-declared identifiers.
1479 if (isTentativelyDeclared(Name)) {
1480 // Identifier has been tentatively declared, and thus cannot be resolved as
1481 // an expression. Fall back to annotating it as a type.
1482 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1484 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1487 Token Next = NextToken();
1489 // Look up and classify the identifier. We don't perform any typo-correction
1490 // after a scope specifier, because in general we can't recover from typos
1491 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1492 // jump back into scope specifier parsing).
1493 Sema::NameClassification Classification = Actions.ClassifyName(
1494 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1495 SS.isEmpty() ? std::move(CCC) : nullptr);
1497 switch (Classification.getKind()) {
1498 case Sema::NC_Error:
1501 case Sema::NC_Keyword:
1502 // The identifier was typo-corrected to a keyword.
1503 Tok.setIdentifierInfo(Name);
1504 Tok.setKind(Name->getTokenID());
1505 PP.TypoCorrectToken(Tok);
1506 if (SS.isNotEmpty())
1507 AnnotateScopeToken(SS, !WasScopeAnnotation);
1508 // We've "annotated" this as a keyword.
1511 case Sema::NC_Unknown:
1512 // It's not something we know about. Leave it unannotated.
1515 case Sema::NC_Type: {
1516 SourceLocation BeginLoc = NameLoc;
1517 if (SS.isNotEmpty())
1518 BeginLoc = SS.getBeginLoc();
1520 /// An Objective-C object type followed by '<' is a specialization of
1521 /// a parameterized class type or a protocol-qualified type.
1522 ParsedType Ty = Classification.getType();
1523 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1524 (Ty.get()->isObjCObjectType() ||
1525 Ty.get()->isObjCObjectPointerType())) {
1526 // Consume the name.
1527 SourceLocation IdentifierLoc = ConsumeToken();
1528 SourceLocation NewEndLoc;
1530 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1531 /*consumeLastToken=*/false,
1533 if (NewType.isUsable())
1535 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1539 Tok.setKind(tok::annot_typename);
1540 setTypeAnnotation(Tok, Ty);
1541 Tok.setAnnotationEndLoc(Tok.getLocation());
1542 Tok.setLocation(BeginLoc);
1543 PP.AnnotateCachedTokens(Tok);
1547 case Sema::NC_Expression:
1548 Tok.setKind(tok::annot_primary_expr);
1549 setExprAnnotation(Tok, Classification.getExpression());
1550 Tok.setAnnotationEndLoc(NameLoc);
1551 if (SS.isNotEmpty())
1552 Tok.setLocation(SS.getBeginLoc());
1553 PP.AnnotateCachedTokens(Tok);
1556 case Sema::NC_TypeTemplate:
1557 if (Next.isNot(tok::less)) {
1558 // This may be a type template being used as a template template argument.
1559 if (SS.isNotEmpty())
1560 AnnotateScopeToken(SS, !WasScopeAnnotation);
1561 return ANK_TemplateName;
1564 case Sema::NC_VarTemplate:
1565 case Sema::NC_FunctionTemplate: {
1566 // We have a type, variable or function template followed by '<'.
1569 Id.setIdentifier(Name, NameLoc);
1570 if (AnnotateTemplateIdToken(
1571 TemplateTy::make(Classification.getTemplateName()),
1572 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1577 case Sema::NC_NestedNameSpecifier:
1578 llvm_unreachable("already parsed nested name specifier");
1581 // Unable to classify the name, but maybe we can annotate a scope specifier.
1582 if (SS.isNotEmpty())
1583 AnnotateScopeToken(SS, !WasScopeAnnotation);
1584 return ANK_Unresolved;
1587 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1588 assert(Tok.isNot(tok::identifier));
1589 Diag(Tok, diag::ext_keyword_as_ident)
1590 << PP.getSpelling(Tok)
1593 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1594 Tok.setKind(tok::identifier);
1598 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1599 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1600 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1601 /// with a single annotation token representing the typename or C++ scope
1603 /// This simplifies handling of C++ scope specifiers and allows efficient
1604 /// backtracking without the need to re-parse and resolve nested-names and
1606 /// It will mainly be called when we expect to treat identifiers as typenames
1607 /// (if they are typenames). For example, in C we do not expect identifiers
1608 /// inside expressions to be treated as typenames so it will not be called
1609 /// for expressions in C.
1610 /// The benefit for C/ObjC is that a typename will be annotated and
1611 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1612 /// will not be called twice, once to check whether we have a declaration
1613 /// specifier, and another one to get the actual type inside
1614 /// ParseDeclarationSpecifiers).
1616 /// This returns true if an error occurred.
1618 /// Note that this routine emits an error if you call it with ::new or ::delete
1619 /// as the current tokens, so only call it in contexts where these are invalid.
1620 bool Parser::TryAnnotateTypeOrScopeToken() {
1621 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1622 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1623 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1624 Tok.is(tok::kw___super)) &&
1625 "Cannot be a type or scope token!");
1627 if (Tok.is(tok::kw_typename)) {
1628 // MSVC lets you do stuff like:
1629 // typename typedef T_::D D;
1631 // We will consume the typedef token here and put it back after we have
1632 // parsed the first identifier, transforming it into something more like:
1633 // typename T_::D typedef D;
1634 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1636 PP.Lex(TypedefToken);
1637 bool Result = TryAnnotateTypeOrScopeToken();
1641 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1645 // Parse a C++ typename-specifier, e.g., "typename T::type".
1647 // typename-specifier:
1648 // 'typename' '::' [opt] nested-name-specifier identifier
1649 // 'typename' '::' [opt] nested-name-specifier template [opt]
1650 // simple-template-id
1651 SourceLocation TypenameLoc = ConsumeToken();
1653 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1654 /*EnteringContext=*/false, nullptr,
1655 /*IsTypename*/ true))
1658 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1659 Tok.is(tok::annot_decltype)) {
1660 // Attempt to recover by skipping the invalid 'typename'
1661 if (Tok.is(tok::annot_decltype) ||
1662 (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1663 unsigned DiagID = diag::err_expected_qualified_after_typename;
1664 // MS compatibility: MSVC permits using known types with typename.
1665 // e.g. "typedef typename T* pointer_type"
1666 if (getLangOpts().MicrosoftExt)
1667 DiagID = diag::warn_expected_qualified_after_typename;
1668 Diag(Tok.getLocation(), DiagID);
1672 if (Tok.isEditorPlaceholder())
1675 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1680 if (Tok.is(tok::identifier)) {
1681 // FIXME: check whether the next token is '<', first!
1682 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1683 *Tok.getIdentifierInfo(),
1685 } else if (Tok.is(tok::annot_template_id)) {
1686 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1687 if (TemplateId->Kind != TNK_Type_template &&
1688 TemplateId->Kind != TNK_Dependent_template_name) {
1689 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1690 << Tok.getAnnotationRange();
1694 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1695 TemplateId->NumArgs);
1697 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1698 TemplateId->TemplateKWLoc,
1699 TemplateId->Template,
1701 TemplateId->TemplateNameLoc,
1702 TemplateId->LAngleLoc,
1704 TemplateId->RAngleLoc);
1706 Diag(Tok, diag::err_expected_type_name_after_typename)
1711 SourceLocation EndLoc = Tok.getLastLoc();
1712 Tok.setKind(tok::annot_typename);
1713 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1714 Tok.setAnnotationEndLoc(EndLoc);
1715 Tok.setLocation(TypenameLoc);
1716 PP.AnnotateCachedTokens(Tok);
1720 // Remembers whether the token was originally a scope annotation.
1721 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1724 if (getLangOpts().CPlusPlus)
1725 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
1728 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1731 /// \brief Try to annotate a type or scope token, having already parsed an
1732 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1733 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1734 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
1736 if (Tok.is(tok::identifier)) {
1737 // Determine whether the identifier is a type name.
1738 if (ParsedType Ty = Actions.getTypeName(
1739 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1740 false, NextToken().is(tok::period), nullptr,
1741 /*IsCtorOrDtorName=*/false,
1742 /*NonTrivialTypeSourceInfo*/ true,
1743 /*IsClassTemplateDeductionContext*/GreaterThanIsOperator)) {
1744 SourceLocation BeginLoc = Tok.getLocation();
1745 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1746 BeginLoc = SS.getBeginLoc();
1748 /// An Objective-C object type followed by '<' is a specialization of
1749 /// a parameterized class type or a protocol-qualified type.
1750 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1751 (Ty.get()->isObjCObjectType() ||
1752 Ty.get()->isObjCObjectPointerType())) {
1753 // Consume the name.
1754 SourceLocation IdentifierLoc = ConsumeToken();
1755 SourceLocation NewEndLoc;
1757 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1758 /*consumeLastToken=*/false,
1760 if (NewType.isUsable())
1762 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1766 // This is a typename. Replace the current token in-place with an
1767 // annotation type token.
1768 Tok.setKind(tok::annot_typename);
1769 setTypeAnnotation(Tok, Ty);
1770 Tok.setAnnotationEndLoc(Tok.getLocation());
1771 Tok.setLocation(BeginLoc);
1773 // In case the tokens were cached, have Preprocessor replace
1774 // them with the annotation token.
1775 PP.AnnotateCachedTokens(Tok);
1779 if (!getLangOpts().CPlusPlus) {
1780 // If we're in C, we can't have :: tokens at all (the lexer won't return
1781 // them). If the identifier is not a type, then it can't be scope either,
1786 // If this is a template-id, annotate with a template-id or type token.
1787 if (NextToken().is(tok::less)) {
1788 TemplateTy Template;
1789 UnqualifiedId TemplateName;
1790 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1791 bool MemberOfUnknownSpecialization;
1792 if (TemplateNameKind TNK = Actions.isTemplateName(
1794 /*hasTemplateKeyword=*/false, TemplateName,
1795 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1796 MemberOfUnknownSpecialization)) {
1797 // Consume the identifier.
1799 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1801 // If an unrecoverable error occurred, we need to return true here,
1802 // because the token stream is in a damaged state. We may not return
1803 // a valid identifier.
1809 // The current token, which is either an identifier or a
1810 // template-id, is not part of the annotation. Fall through to
1811 // push that token back into the stream and complete the C++ scope
1812 // specifier annotation.
1815 if (Tok.is(tok::annot_template_id)) {
1816 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1817 if (TemplateId->Kind == TNK_Type_template) {
1818 // A template-id that refers to a type was parsed into a
1819 // template-id annotation in a context where we weren't allowed
1820 // to produce a type annotation token. Update the template-id
1821 // annotation token to a type annotation token now.
1822 AnnotateTemplateIdTokenAsType();
1830 // A C++ scope specifier that isn't followed by a typename.
1831 AnnotateScopeToken(SS, IsNewScope);
1835 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1836 /// annotates C++ scope specifiers and template-ids. This returns
1837 /// true if there was an error that could not be recovered from.
1839 /// Note that this routine emits an error if you call it with ::new or ::delete
1840 /// as the current tokens, so only call it in contexts where these are invalid.
1841 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1842 assert(getLangOpts().CPlusPlus &&
1843 "Call sites of this function should be guarded by checking for C++");
1844 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1845 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1846 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1847 "Cannot be a type or scope token!");
1850 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1855 AnnotateScopeToken(SS, true);
1859 bool Parser::isTokenEqualOrEqualTypo() {
1860 tok::TokenKind Kind = Tok.getKind();
1864 case tok::ampequal: // &=
1865 case tok::starequal: // *=
1866 case tok::plusequal: // +=
1867 case tok::minusequal: // -=
1868 case tok::exclaimequal: // !=
1869 case tok::slashequal: // /=
1870 case tok::percentequal: // %=
1871 case tok::lessequal: // <=
1872 case tok::lesslessequal: // <<=
1873 case tok::greaterequal: // >=
1874 case tok::greatergreaterequal: // >>=
1875 case tok::caretequal: // ^=
1876 case tok::pipeequal: // |=
1877 case tok::equalequal: // ==
1878 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1880 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1887 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1888 assert(Tok.is(tok::code_completion));
1889 PrevTokLocation = Tok.getLocation();
1891 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1892 if (S->getFlags() & Scope::FnScope) {
1893 Actions.CodeCompleteOrdinaryName(getCurScope(),
1894 Sema::PCC_RecoveryInFunction);
1896 return PrevTokLocation;
1899 if (S->getFlags() & Scope::ClassScope) {
1900 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1902 return PrevTokLocation;
1906 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1908 return PrevTokLocation;
1911 // Code-completion pass-through functions
1913 void Parser::CodeCompleteDirective(bool InConditional) {
1914 Actions.CodeCompletePreprocessorDirective(InConditional);
1917 void Parser::CodeCompleteInConditionalExclusion() {
1918 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1921 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1922 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1925 void Parser::CodeCompletePreprocessorExpression() {
1926 Actions.CodeCompletePreprocessorExpression();
1929 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1930 MacroInfo *MacroInfo,
1931 unsigned ArgumentIndex) {
1932 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1936 void Parser::CodeCompleteNaturalLanguage() {
1937 Actions.CodeCompleteNaturalLanguage();
1940 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1941 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1942 "Expected '__if_exists' or '__if_not_exists'");
1943 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1944 Result.KeywordLoc = ConsumeToken();
1946 BalancedDelimiterTracker T(*this, tok::l_paren);
1947 if (T.consumeOpen()) {
1948 Diag(Tok, diag::err_expected_lparen_after)
1949 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1953 // Parse nested-name-specifier.
1954 if (getLangOpts().CPlusPlus)
1955 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1956 /*EnteringContext=*/false);
1958 // Check nested-name specifier.
1959 if (Result.SS.isInvalid()) {
1964 // Parse the unqualified-id.
1965 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1966 if (ParseUnqualifiedId(
1967 Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
1968 /*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
1969 TemplateKWLoc, Result.Name)) {
1974 if (T.consumeClose())
1977 // Check if the symbol exists.
1978 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1979 Result.IsIfExists, Result.SS,
1981 case Sema::IER_Exists:
1982 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1985 case Sema::IER_DoesNotExist:
1986 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
1989 case Sema::IER_Dependent:
1990 Result.Behavior = IEB_Dependent;
1993 case Sema::IER_Error:
2000 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2001 IfExistsCondition Result;
2002 if (ParseMicrosoftIfExistsCondition(Result))
2005 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2006 if (Braces.consumeOpen()) {
2007 Diag(Tok, diag::err_expected) << tok::l_brace;
2011 switch (Result.Behavior) {
2013 // Parse declarations below.
2017 llvm_unreachable("Cannot have a dependent external declaration");
2024 // Parse the declarations.
2025 // FIXME: Support module import within __if_exists?
2026 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2027 ParsedAttributesWithRange attrs(AttrFactory);
2028 MaybeParseCXX11Attributes(attrs);
2029 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2030 if (Result && !getCurScope()->getParent())
2031 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2033 Braces.consumeClose();
2036 /// Parse a C++ Modules TS module declaration, which appears at the beginning
2037 /// of a module interface, module partition, or module implementation file.
2039 /// module-declaration: [Modules TS + P0273R0 + P0629R0]
2040 /// 'export'[opt] 'module' 'partition'[opt]
2041 /// module-name attribute-specifier-seq[opt] ';'
2043 /// Note that 'partition' is a context-sensitive keyword.
2044 Parser::DeclGroupPtrTy Parser::ParseModuleDecl() {
2045 SourceLocation StartLoc = Tok.getLocation();
2047 Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
2048 ? Sema::ModuleDeclKind::Module
2049 : Sema::ModuleDeclKind::Implementation;
2051 assert(Tok.is(tok::kw_module) && "not a module declaration");
2052 SourceLocation ModuleLoc = ConsumeToken();
2054 if (Tok.is(tok::identifier) && NextToken().is(tok::identifier) &&
2055 Tok.getIdentifierInfo()->isStr("partition")) {
2056 // If 'partition' is present, this must be a module interface unit.
2057 if (MDK != Sema::ModuleDeclKind::Module)
2058 Diag(Tok.getLocation(), diag::err_module_implementation_partition)
2059 << FixItHint::CreateInsertion(ModuleLoc, "export ");
2060 MDK = Sema::ModuleDeclKind::Partition;
2064 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2065 if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2068 // We don't support any module attributes yet; just parse them and diagnose.
2069 ParsedAttributesWithRange Attrs(AttrFactory);
2070 MaybeParseCXX11Attributes(Attrs);
2071 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2073 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2075 return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path);
2078 /// Parse a module import declaration. This is essentially the same for
2079 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2080 /// and the trailing optional attributes (in C++).
2082 /// [ObjC] @import declaration:
2083 /// '@' 'import' module-name ';'
2084 /// [ModTS] module-import-declaration:
2085 /// 'import' module-name attribute-specifier-seq[opt] ';'
2086 Parser::DeclGroupPtrTy Parser::ParseModuleImport(SourceLocation AtLoc) {
2087 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2088 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2089 "Improper start to module import");
2090 SourceLocation ImportLoc = ConsumeToken();
2091 SourceLocation StartLoc = AtLoc.isInvalid() ? ImportLoc : AtLoc;
2093 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2094 if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2097 ParsedAttributesWithRange Attrs(AttrFactory);
2098 MaybeParseCXX11Attributes(Attrs);
2099 // We don't support any module import attributes yet.
2100 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2102 if (PP.hadModuleLoaderFatalFailure()) {
2103 // With a fatal failure in the module loader, we abort parsing.
2108 DeclResult Import = Actions.ActOnModuleImport(StartLoc, ImportLoc, Path);
2109 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2110 if (Import.isInvalid())
2113 return Actions.ConvertDeclToDeclGroup(Import.get());
2116 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2120 /// module-name-qualifier[opt] identifier
2121 /// module-name-qualifier:
2122 /// module-name-qualifier[opt] identifier '.'
2123 bool Parser::ParseModuleName(
2124 SourceLocation UseLoc,
2125 SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2127 // Parse the module path.
2129 if (!Tok.is(tok::identifier)) {
2130 if (Tok.is(tok::code_completion)) {
2131 Actions.CodeCompleteModuleImport(UseLoc, Path);
2136 Diag(Tok, diag::err_module_expected_ident) << IsImport;
2137 SkipUntil(tok::semi);
2141 // Record this part of the module path.
2142 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2145 if (Tok.isNot(tok::period))
2152 /// \brief Try recover parser when module annotation appears where it must not
2154 /// \returns false if the recover was successful and parsing may be continued, or
2155 /// true if parser must bail out to top level and handle the token there.
2156 bool Parser::parseMisplacedModuleImport() {
2158 switch (Tok.getKind()) {
2159 case tok::annot_module_end:
2160 // If we recovered from a misplaced module begin, we expect to hit a
2161 // misplaced module end too. Stay in the current context when this
2163 if (MisplacedModuleBeginCount) {
2164 --MisplacedModuleBeginCount;
2165 Actions.ActOnModuleEnd(Tok.getLocation(),
2166 reinterpret_cast<Module *>(
2167 Tok.getAnnotationValue()));
2168 ConsumeAnnotationToken();
2171 // Inform caller that recovery failed, the error must be handled at upper
2172 // level. This will generate the desired "missing '}' at end of module"
2173 // diagnostics on the way out.
2175 case tok::annot_module_begin:
2176 // Recover by entering the module (Sema will diagnose).
2177 Actions.ActOnModuleBegin(Tok.getLocation(),
2178 reinterpret_cast<Module *>(
2179 Tok.getAnnotationValue()));
2180 ConsumeAnnotationToken();
2181 ++MisplacedModuleBeginCount;
2183 case tok::annot_module_include:
2184 // Module import found where it should not be, for instance, inside a
2185 // namespace. Recover by importing the module.
2186 Actions.ActOnModuleInclude(Tok.getLocation(),
2187 reinterpret_cast<Module *>(
2188 Tok.getAnnotationValue()));
2189 ConsumeAnnotationToken();
2190 // If there is another module import, process it.
2199 bool BalancedDelimiterTracker::diagnoseOverflow() {
2200 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2201 << P.getLangOpts().BracketDepth;
2202 P.Diag(P.Tok, diag::note_bracket_depth);
2207 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2209 tok::TokenKind SkipToTok) {
2210 LOpen = P.Tok.getLocation();
2211 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2212 if (SkipToTok != tok::unknown)
2213 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2217 if (getDepth() < MaxDepth)
2220 return diagnoseOverflow();
2223 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2224 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2226 if (P.Tok.is(tok::annot_module_end))
2227 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2229 P.Diag(P.Tok, diag::err_expected) << Close;
2230 P.Diag(LOpen, diag::note_matching) << Kind;
2232 // If we're not already at some kind of closing bracket, skip to our closing
2234 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2235 P.Tok.isNot(tok::r_square) &&
2236 P.SkipUntil(Close, FinalToken,
2237 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2239 LClose = P.ConsumeAnyToken();
2243 void BalancedDelimiterTracker::skipToEnd() {
2244 P.SkipUntil(Close, Parser::StopBeforeMatch);