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.
520 PP.replayPreambleConditionalStack();
523 void Parser::LateTemplateParserCleanupCallback(void *P) {
524 // While this RAII helper doesn't bracket any actual work, the destructor will
525 // clean up annotations that were created during ActOnEndOfTranslationUnit
526 // when incremental processing is enabled.
527 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
530 bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result) {
531 Actions.ActOnStartOfTranslationUnit();
533 // C11 6.9p1 says translation units must have at least one top-level
534 // declaration. C++ doesn't have this restriction. We also don't want to
535 // complain if we have a precompiled header, although technically if the PCH
536 // is empty we should still emit the (pedantic) diagnostic.
537 bool NoTopLevelDecls = ParseTopLevelDecl(Result);
538 if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
539 !getLangOpts().CPlusPlus)
540 Diag(diag::ext_empty_translation_unit);
542 return NoTopLevelDecls;
545 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
546 /// action tells us to. This returns true if the EOF was encountered.
547 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
548 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
550 // Skip over the EOF token, flagging end of previous input for incremental
552 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
556 switch (Tok.getKind()) {
557 case tok::annot_pragma_unused:
558 HandlePragmaUnused();
562 Result = ParseModuleImport(SourceLocation());
566 if (NextToken().isNot(tok::kw_module))
570 Result = ParseModuleDecl();
573 case tok::annot_module_include:
574 Actions.ActOnModuleInclude(Tok.getLocation(),
575 reinterpret_cast<Module *>(
576 Tok.getAnnotationValue()));
577 ConsumeAnnotationToken();
580 case tok::annot_module_begin:
581 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
582 Tok.getAnnotationValue()));
583 ConsumeAnnotationToken();
586 case tok::annot_module_end:
587 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
588 Tok.getAnnotationValue()));
589 ConsumeAnnotationToken();
592 case tok::annot_pragma_attribute:
593 HandlePragmaAttribute();
597 // Late template parsing can begin.
598 if (getLangOpts().DelayedTemplateParsing)
599 Actions.SetLateTemplateParser(LateTemplateParserCallback,
600 PP.isIncrementalProcessingEnabled() ?
601 LateTemplateParserCleanupCallback : nullptr,
603 if (!PP.isIncrementalProcessingEnabled())
604 Actions.ActOnEndOfTranslationUnit();
605 //else don't tell Sema that we ended parsing: more input might come.
612 ParsedAttributesWithRange attrs(AttrFactory);
613 MaybeParseCXX11Attributes(attrs);
615 Result = ParseExternalDeclaration(attrs);
619 /// ParseExternalDeclaration:
621 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
622 /// function-definition
624 /// [GNU] asm-definition
625 /// [GNU] __extension__ external-declaration
626 /// [OBJC] objc-class-definition
627 /// [OBJC] objc-class-declaration
628 /// [OBJC] objc-alias-declaration
629 /// [OBJC] objc-protocol-definition
630 /// [OBJC] objc-method-definition
632 /// [C++] linkage-specification
633 /// [GNU] asm-definition:
634 /// simple-asm-expr ';'
635 /// [C++11] empty-declaration
636 /// [C++11] attribute-declaration
638 /// [C++11] empty-declaration:
641 /// [C++0x/GNU] 'extern' 'template' declaration
642 Parser::DeclGroupPtrTy
643 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
644 ParsingDeclSpec *DS) {
645 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
646 ParenBraceBracketBalancer BalancerRAIIObj(*this);
648 if (PP.isCodeCompletionReached()) {
653 Decl *SingleDecl = nullptr;
654 switch (Tok.getKind()) {
655 case tok::annot_pragma_vis:
656 HandlePragmaVisibility();
658 case tok::annot_pragma_pack:
661 case tok::annot_pragma_msstruct:
662 HandlePragmaMSStruct();
664 case tok::annot_pragma_align:
667 case tok::annot_pragma_weak:
670 case tok::annot_pragma_weakalias:
671 HandlePragmaWeakAlias();
673 case tok::annot_pragma_redefine_extname:
674 HandlePragmaRedefineExtname();
676 case tok::annot_pragma_fp_contract:
677 HandlePragmaFPContract();
679 case tok::annot_pragma_fp:
682 case tok::annot_pragma_opencl_extension:
683 HandlePragmaOpenCLExtension();
685 case tok::annot_pragma_openmp: {
686 AccessSpecifier AS = AS_none;
687 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
689 case tok::annot_pragma_ms_pointers_to_members:
690 HandlePragmaMSPointersToMembers();
692 case tok::annot_pragma_ms_vtordisp:
693 HandlePragmaMSVtorDisp();
695 case tok::annot_pragma_ms_pragma:
696 HandlePragmaMSPragma();
698 case tok::annot_pragma_dump:
702 // Either a C++11 empty-declaration or attribute-declaration.
703 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
706 ConsumeExtraSemi(OutsideFunction);
709 Diag(Tok, diag::err_extraneous_closing_brace);
713 Diag(Tok, diag::err_expected_external_declaration);
715 case tok::kw___extension__: {
716 // __extension__ silences extension warnings in the subexpression.
717 ExtensionRAIIObject O(Diags); // Use RAII to do this.
719 return ParseExternalDeclaration(attrs);
722 ProhibitAttributes(attrs);
724 SourceLocation StartLoc = Tok.getLocation();
725 SourceLocation EndLoc;
727 ExprResult Result(ParseSimpleAsm(&EndLoc));
729 // Check if GNU-style InlineAsm is disabled.
730 // Empty asm string is allowed because it will not introduce
731 // any assembly code.
732 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
733 const auto *SL = cast<StringLiteral>(Result.get());
734 if (!SL->getString().trim().empty())
735 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
738 ExpectAndConsume(tok::semi, diag::err_expected_after,
739 "top-level asm block");
741 if (Result.isInvalid())
743 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
747 return ParseObjCAtDirectives();
750 if (!getLangOpts().ObjC1) {
751 Diag(Tok, diag::err_expected_external_declaration);
755 SingleDecl = ParseObjCMethodDefinition();
757 case tok::code_completion:
758 Actions.CodeCompleteOrdinaryName(getCurScope(),
759 CurParsedObjCImpl? Sema::PCC_ObjCImplementation
760 : Sema::PCC_Namespace);
764 if (getLangOpts().ModulesTS) {
765 SingleDecl = ParseExportDeclaration();
768 // This must be 'export template'. Parse it so we can diagnose our lack
772 case tok::kw_namespace:
773 case tok::kw_typedef:
774 case tok::kw_template:
775 case tok::kw_static_assert:
776 case tok::kw__Static_assert:
777 // A function definition cannot start with any of these keywords.
779 SourceLocation DeclEnd;
780 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
784 // Parse (then ignore) 'static' prior to a template instantiation. This is
785 // a GCC extension that we intentionally do not support.
786 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
787 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
789 SourceLocation DeclEnd;
790 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
795 if (getLangOpts().CPlusPlus) {
796 tok::TokenKind NextKind = NextToken().getKind();
798 // Inline namespaces. Allowed as an extension even in C++03.
799 if (NextKind == tok::kw_namespace) {
800 SourceLocation DeclEnd;
801 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
804 // Parse (then ignore) 'inline' prior to a template instantiation. This is
805 // a GCC extension that we intentionally do not support.
806 if (NextKind == tok::kw_template) {
807 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
809 SourceLocation DeclEnd;
810 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
816 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
818 SourceLocation ExternLoc = ConsumeToken();
819 SourceLocation TemplateLoc = ConsumeToken();
820 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
821 diag::warn_cxx98_compat_extern_template :
822 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
823 SourceLocation DeclEnd;
824 return Actions.ConvertDeclToDeclGroup(
825 ParseExplicitInstantiation(Declarator::FileContext,
826 ExternLoc, TemplateLoc, DeclEnd));
830 case tok::kw___if_exists:
831 case tok::kw___if_not_exists:
832 ParseMicrosoftIfExistsExternalDeclaration();
836 Diag(Tok, diag::err_unexpected_module_decl);
837 SkipUntil(tok::semi);
842 if (Tok.isEditorPlaceholder()) {
846 // We can't tell whether this is a function-definition or declaration yet.
847 return ParseDeclarationOrFunctionDefinition(attrs, DS);
850 // This routine returns a DeclGroup, if the thing we parsed only contains a
851 // single decl, convert it now.
852 return Actions.ConvertDeclToDeclGroup(SingleDecl);
855 /// \brief Determine whether the current token, if it occurs after a
856 /// declarator, continues a declaration or declaration list.
857 bool Parser::isDeclarationAfterDeclarator() {
858 // Check for '= delete' or '= default'
859 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
860 const Token &KW = NextToken();
861 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
865 return Tok.is(tok::equal) || // int X()= -> not a function def
866 Tok.is(tok::comma) || // int X(), -> not a function def
867 Tok.is(tok::semi) || // int X(); -> not a function def
868 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
869 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
870 (getLangOpts().CPlusPlus &&
871 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
874 /// \brief Determine whether the current token, if it occurs after a
875 /// declarator, indicates the start of a function definition.
876 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
877 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
878 if (Tok.is(tok::l_brace)) // int X() {}
881 // Handle K&R C argument lists: int X(f) int f; {}
882 if (!getLangOpts().CPlusPlus &&
883 Declarator.getFunctionTypeInfo().isKNRPrototype())
884 return isDeclarationSpecifier();
886 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
887 const Token &KW = NextToken();
888 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
891 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
892 Tok.is(tok::kw_try); // X() try { ... }
895 /// Parse either a function-definition or a declaration. We can't tell which
896 /// we have until we read up to the compound-statement in function-definition.
897 /// TemplateParams, if non-NULL, provides the template parameters when we're
898 /// parsing a C++ template-declaration.
900 /// function-definition: [C99 6.9.1]
901 /// decl-specs declarator declaration-list[opt] compound-statement
902 /// [C90] function-definition: [C99 6.7.1] - implicit int result
903 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
905 /// declaration: [C99 6.7]
906 /// declaration-specifiers init-declarator-list[opt] ';'
907 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
908 /// [OMP] threadprivate-directive [TODO]
910 Parser::DeclGroupPtrTy
911 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
913 AccessSpecifier AS) {
914 MaybeParseMicrosoftAttributes(DS.getAttributes());
915 // Parse the common declaration-specifiers piece.
916 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
918 // If we had a free-standing type definition with a missing semicolon, we
919 // may get this far before the problem becomes obvious.
920 if (DS.hasTagDefinition() &&
921 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
924 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
925 // declaration-specifiers init-declarator-list[opt] ';'
926 if (Tok.is(tok::semi)) {
927 ProhibitAttributes(attrs);
929 RecordDecl *AnonRecord = nullptr;
930 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
932 DS.complete(TheDecl);
933 if (getLangOpts().OpenCL)
934 Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
936 Decl* decls[] = {AnonRecord, TheDecl};
937 return Actions.BuildDeclaratorGroup(decls);
939 return Actions.ConvertDeclToDeclGroup(TheDecl);
942 DS.takeAttributesFrom(attrs);
944 // ObjC2 allows prefix attributes on class interfaces and protocols.
945 // FIXME: This still needs better diagnostics. We should only accept
946 // attributes here, no types, etc.
947 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
948 SourceLocation AtLoc = ConsumeToken(); // the "@"
949 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
950 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
951 Diag(Tok, diag::err_objc_unexpected_attr);
952 SkipUntil(tok::semi); // FIXME: better skip?
958 const char *PrevSpec = nullptr;
960 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
961 Actions.getASTContext().getPrintingPolicy()))
962 Diag(AtLoc, DiagID) << PrevSpec;
964 if (Tok.isObjCAtKeyword(tok::objc_protocol))
965 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
967 return Actions.ConvertDeclToDeclGroup(
968 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
971 // If the declspec consisted only of 'extern' and we have a string
972 // literal following it, this must be a C++ linkage specifier like
974 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
975 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
976 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
977 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
978 return Actions.ConvertDeclToDeclGroup(TheDecl);
981 return ParseDeclGroup(DS, Declarator::FileContext);
984 Parser::DeclGroupPtrTy
985 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
987 AccessSpecifier AS) {
989 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
991 ParsingDeclSpec PDS(*this);
992 // Must temporarily exit the objective-c container scope for
993 // parsing c constructs and re-enter objc container scope
995 ObjCDeclContextSwitch ObjCDC(*this);
997 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
1001 /// ParseFunctionDefinition - We parsed and verified that the specified
1002 /// Declarator is well formed. If this is a K&R-style function, read the
1003 /// parameters declaration-list, then start the compound-statement.
1005 /// function-definition: [C99 6.9.1]
1006 /// decl-specs declarator declaration-list[opt] compound-statement
1007 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1008 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1009 /// [C++] function-definition: [C++ 8.4]
1010 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1012 /// [C++] function-definition: [C++ 8.4]
1013 /// decl-specifier-seq[opt] declarator function-try-block
1015 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1016 const ParsedTemplateInfo &TemplateInfo,
1017 LateParsedAttrList *LateParsedAttrs) {
1018 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1019 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1020 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1022 // If this is C90 and the declspecs were completely missing, fudge in an
1023 // implicit int. We do this here because this is the only place where
1024 // declaration-specifiers are completely optional in the grammar.
1025 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1026 const char *PrevSpec;
1028 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1029 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
1030 D.getIdentifierLoc(),
1033 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1036 // If this declaration was formed with a K&R-style identifier list for the
1037 // arguments, parse declarations for all of the args next.
1038 // int foo(a,b) int a; float b; {}
1039 if (FTI.isKNRPrototype())
1040 ParseKNRParamDeclarations(D);
1042 // We should have either an opening brace or, in a C++ constructor,
1043 // we may have a colon.
1044 if (Tok.isNot(tok::l_brace) &&
1045 (!getLangOpts().CPlusPlus ||
1046 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1047 Tok.isNot(tok::equal)))) {
1048 Diag(Tok, diag::err_expected_fn_body);
1050 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1051 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1053 // If we didn't find the '{', bail out.
1054 if (Tok.isNot(tok::l_brace))
1058 // Check to make sure that any normal attributes are allowed to be on
1059 // a definition. Late parsed attributes are checked at the end.
1060 if (Tok.isNot(tok::equal)) {
1061 AttributeList *DtorAttrs = D.getAttributes();
1063 if (DtorAttrs->isKnownToGCC() &&
1064 !DtorAttrs->isCXX11Attribute()) {
1065 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1066 << DtorAttrs->getName();
1068 DtorAttrs = DtorAttrs->getNext();
1072 // In delayed template parsing mode, for function template we consume the
1073 // tokens and store them for late parsing at the end of the translation unit.
1074 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1075 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1076 Actions.canDelayFunctionBody(D)) {
1077 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1079 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1080 Scope *ParentScope = getCurScope()->getParent();
1082 D.setFunctionDefinitionKind(FDK_Definition);
1083 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1084 TemplateParameterLists);
1086 D.getMutableDeclSpec().abort();
1088 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1089 trySkippingFunctionBody()) {
1091 return Actions.ActOnSkippedFunctionBody(DP);
1095 LexTemplateFunctionForLateParsing(Toks);
1098 FunctionDecl *FnD = DP->getAsFunction();
1099 Actions.CheckForFunctionRedefinition(FnD);
1100 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1104 else if (CurParsedObjCImpl &&
1105 !TemplateInfo.TemplateParams &&
1106 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1107 Tok.is(tok::colon)) &&
1108 Actions.CurContext->isTranslationUnit()) {
1109 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1110 Scope *ParentScope = getCurScope()->getParent();
1112 D.setFunctionDefinitionKind(FDK_Definition);
1113 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1114 MultiTemplateParamsArg());
1115 D.complete(FuncDecl);
1116 D.getMutableDeclSpec().abort();
1118 // Consume the tokens and store them for later parsing.
1119 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1120 CurParsedObjCImpl->HasCFunction = true;
1123 // FIXME: Should we really fall through here?
1126 // Enter a scope for the function body.
1127 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1129 // Tell the actions module that we have entered a function definition with the
1130 // specified Declarator for the function.
1131 Sema::SkipBodyInfo SkipBody;
1132 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1133 TemplateInfo.TemplateParams
1134 ? *TemplateInfo.TemplateParams
1135 : MultiTemplateParamsArg(),
1138 if (SkipBody.ShouldSkip) {
1143 // Break out of the ParsingDeclarator context before we parse the body.
1146 // Break out of the ParsingDeclSpec context, too. This const_cast is
1147 // safe because we're always the sole owner.
1148 D.getMutableDeclSpec().abort();
1150 if (TryConsumeToken(tok::equal)) {
1151 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1153 bool Delete = false;
1154 SourceLocation KWLoc;
1155 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1156 Diag(KWLoc, getLangOpts().CPlusPlus11
1157 ? diag::warn_cxx98_compat_defaulted_deleted_function
1158 : diag::ext_defaulted_deleted_function)
1160 Actions.SetDeclDeleted(Res, KWLoc);
1162 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1163 Diag(KWLoc, getLangOpts().CPlusPlus11
1164 ? diag::warn_cxx98_compat_defaulted_deleted_function
1165 : diag::ext_defaulted_deleted_function)
1166 << 0 /* defaulted */;
1167 Actions.SetDeclDefaulted(Res, KWLoc);
1169 llvm_unreachable("function definition after = not 'delete' or 'default'");
1172 if (Tok.is(tok::comma)) {
1173 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1175 SkipUntil(tok::semi);
1176 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1177 Delete ? "delete" : "default")) {
1178 SkipUntil(tok::semi);
1181 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1182 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1186 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1187 trySkippingFunctionBody()) {
1189 Actions.ActOnSkippedFunctionBody(Res);
1190 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1193 if (Tok.is(tok::kw_try))
1194 return ParseFunctionTryBlock(Res, BodyScope);
1196 // If we have a colon, then we're probably parsing a C++
1197 // ctor-initializer.
1198 if (Tok.is(tok::colon)) {
1199 ParseConstructorInitializer(Res);
1201 // Recover from error.
1202 if (!Tok.is(tok::l_brace)) {
1204 Actions.ActOnFinishFunctionBody(Res, nullptr);
1208 Actions.ActOnDefaultCtorInitializers(Res);
1210 // Late attributes are parsed in the same scope as the function body.
1211 if (LateParsedAttrs)
1212 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1214 return ParseFunctionStatementBody(Res, BodyScope);
1217 void Parser::SkipFunctionBody() {
1218 if (Tok.is(tok::equal)) {
1219 SkipUntil(tok::semi);
1223 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1224 if (IsFunctionTryBlock)
1227 CachedTokens Skipped;
1228 if (ConsumeAndStoreFunctionPrologue(Skipped))
1229 SkipMalformedDecl();
1231 SkipUntil(tok::r_brace);
1232 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1233 SkipUntil(tok::l_brace);
1234 SkipUntil(tok::r_brace);
1239 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1240 /// types for a function with a K&R-style identifier list for arguments.
1241 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1242 // We know that the top-level of this declarator is a function.
1243 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1245 // Enter function-declaration scope, limiting any declarators to the
1246 // function prototype scope, including parameter declarators.
1247 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1248 Scope::FunctionDeclarationScope | Scope::DeclScope);
1250 // Read all the argument declarations.
1251 while (isDeclarationSpecifier()) {
1252 SourceLocation DSStart = Tok.getLocation();
1254 // Parse the common declaration-specifiers piece.
1255 DeclSpec DS(AttrFactory);
1256 ParseDeclarationSpecifiers(DS);
1258 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1259 // least one declarator'.
1260 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1261 // the declarations though. It's trivial to ignore them, really hard to do
1262 // anything else with them.
1263 if (TryConsumeToken(tok::semi)) {
1264 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1268 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1270 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1271 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1272 Diag(DS.getStorageClassSpecLoc(),
1273 diag::err_invalid_storage_class_in_func_decl);
1274 DS.ClearStorageClassSpecs();
1276 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1277 Diag(DS.getThreadStorageClassSpecLoc(),
1278 diag::err_invalid_storage_class_in_func_decl);
1279 DS.ClearStorageClassSpecs();
1282 // Parse the first declarator attached to this declspec.
1283 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1284 ParseDeclarator(ParmDeclarator);
1286 // Handle the full declarator list.
1288 // If attributes are present, parse them.
1289 MaybeParseGNUAttributes(ParmDeclarator);
1291 // Ask the actions module to compute the type for this declarator.
1293 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1296 // A missing identifier has already been diagnosed.
1297 ParmDeclarator.getIdentifier()) {
1299 // Scan the argument list looking for the correct param to apply this
1301 for (unsigned i = 0; ; ++i) {
1302 // C99 6.9.1p6: those declarators shall declare only identifiers from
1303 // the identifier list.
1304 if (i == FTI.NumParams) {
1305 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1306 << ParmDeclarator.getIdentifier();
1310 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1311 // Reject redefinitions of parameters.
1312 if (FTI.Params[i].Param) {
1313 Diag(ParmDeclarator.getIdentifierLoc(),
1314 diag::err_param_redefinition)
1315 << ParmDeclarator.getIdentifier();
1317 FTI.Params[i].Param = Param;
1324 // If we don't have a comma, it is either the end of the list (a ';') or
1325 // an error, bail out.
1326 if (Tok.isNot(tok::comma))
1329 ParmDeclarator.clear();
1331 // Consume the comma.
1332 ParmDeclarator.setCommaLoc(ConsumeToken());
1334 // Parse the next declarator.
1335 ParseDeclarator(ParmDeclarator);
1338 // Consume ';' and continue parsing.
1339 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1342 // Otherwise recover by skipping to next semi or mandatory function body.
1343 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1345 TryConsumeToken(tok::semi);
1348 // The actions module must verify that all arguments were declared.
1349 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1353 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1354 /// allowed to be a wide string, and is not subject to character translation.
1356 /// [GNU] asm-string-literal:
1359 ExprResult Parser::ParseAsmStringLiteral() {
1360 if (!isTokenStringLiteral()) {
1361 Diag(Tok, diag::err_expected_string_literal)
1362 << /*Source='in...'*/0 << "'asm'";
1366 ExprResult AsmString(ParseStringLiteralExpression());
1367 if (!AsmString.isInvalid()) {
1368 const auto *SL = cast<StringLiteral>(AsmString.get());
1369 if (!SL->isAscii()) {
1370 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1372 << SL->getSourceRange();
1381 /// [GNU] simple-asm-expr:
1382 /// 'asm' '(' asm-string-literal ')'
1384 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1385 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1386 SourceLocation Loc = ConsumeToken();
1388 if (Tok.is(tok::kw_volatile)) {
1389 // Remove from the end of 'asm' to the end of 'volatile'.
1390 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1391 PP.getLocForEndOfToken(Tok.getLocation()));
1393 Diag(Tok, diag::warn_file_asm_volatile)
1394 << FixItHint::CreateRemoval(RemovalRange);
1398 BalancedDelimiterTracker T(*this, tok::l_paren);
1399 if (T.consumeOpen()) {
1400 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1404 ExprResult Result(ParseAsmStringLiteral());
1406 if (!Result.isInvalid()) {
1407 // Close the paren and get the location of the end bracket
1410 *EndLoc = T.getCloseLocation();
1411 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1413 *EndLoc = Tok.getLocation();
1420 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1421 /// cleanup pool so that it gets destroyed when parsing the current top level
1422 /// declaration is finished.
1423 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1424 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1425 TemplateIdAnnotation *
1426 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1430 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1431 // Push the current token back into the token stream (or revert it if it is
1432 // cached) and use an annotation scope token for current token.
1433 if (PP.isBacktrackEnabled())
1434 PP.RevertCachedTokens(1);
1437 Tok.setKind(tok::annot_cxxscope);
1438 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1439 Tok.setAnnotationRange(SS.getRange());
1441 // In case the tokens were cached, have Preprocessor replace them
1442 // with the annotation token. We don't need to do this if we've
1443 // just reverted back to a prior state.
1444 if (IsNewAnnotation)
1445 PP.AnnotateCachedTokens(Tok);
1448 /// \brief Attempt to classify the name at the current token position. This may
1449 /// form a type, scope or primary expression annotation, or replace the token
1450 /// with a typo-corrected keyword. This is only appropriate when the current
1451 /// name must refer to an entity which has already been declared.
1453 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1454 /// and might possibly have a dependent nested name specifier.
1455 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1456 /// no typo correction will be performed.
1457 Parser::AnnotatedNameKind
1458 Parser::TryAnnotateName(bool IsAddressOfOperand,
1459 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1460 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1462 const bool EnteringContext = false;
1463 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1466 if (getLangOpts().CPlusPlus &&
1467 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1470 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1471 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1473 return ANK_Unresolved;
1476 IdentifierInfo *Name = Tok.getIdentifierInfo();
1477 SourceLocation NameLoc = Tok.getLocation();
1479 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1480 // typo-correct to tentatively-declared identifiers.
1481 if (isTentativelyDeclared(Name)) {
1482 // Identifier has been tentatively declared, and thus cannot be resolved as
1483 // an expression. Fall back to annotating it as a type.
1484 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1486 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1489 Token Next = NextToken();
1491 // Look up and classify the identifier. We don't perform any typo-correction
1492 // after a scope specifier, because in general we can't recover from typos
1493 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1494 // jump back into scope specifier parsing).
1495 Sema::NameClassification Classification = Actions.ClassifyName(
1496 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1497 SS.isEmpty() ? std::move(CCC) : nullptr);
1499 switch (Classification.getKind()) {
1500 case Sema::NC_Error:
1503 case Sema::NC_Keyword:
1504 // The identifier was typo-corrected to a keyword.
1505 Tok.setIdentifierInfo(Name);
1506 Tok.setKind(Name->getTokenID());
1507 PP.TypoCorrectToken(Tok);
1508 if (SS.isNotEmpty())
1509 AnnotateScopeToken(SS, !WasScopeAnnotation);
1510 // We've "annotated" this as a keyword.
1513 case Sema::NC_Unknown:
1514 // It's not something we know about. Leave it unannotated.
1517 case Sema::NC_Type: {
1518 SourceLocation BeginLoc = NameLoc;
1519 if (SS.isNotEmpty())
1520 BeginLoc = SS.getBeginLoc();
1522 /// An Objective-C object type followed by '<' is a specialization of
1523 /// a parameterized class type or a protocol-qualified type.
1524 ParsedType Ty = Classification.getType();
1525 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1526 (Ty.get()->isObjCObjectType() ||
1527 Ty.get()->isObjCObjectPointerType())) {
1528 // Consume the name.
1529 SourceLocation IdentifierLoc = ConsumeToken();
1530 SourceLocation NewEndLoc;
1532 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1533 /*consumeLastToken=*/false,
1535 if (NewType.isUsable())
1537 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1541 Tok.setKind(tok::annot_typename);
1542 setTypeAnnotation(Tok, Ty);
1543 Tok.setAnnotationEndLoc(Tok.getLocation());
1544 Tok.setLocation(BeginLoc);
1545 PP.AnnotateCachedTokens(Tok);
1549 case Sema::NC_Expression:
1550 Tok.setKind(tok::annot_primary_expr);
1551 setExprAnnotation(Tok, Classification.getExpression());
1552 Tok.setAnnotationEndLoc(NameLoc);
1553 if (SS.isNotEmpty())
1554 Tok.setLocation(SS.getBeginLoc());
1555 PP.AnnotateCachedTokens(Tok);
1558 case Sema::NC_TypeTemplate:
1559 if (Next.isNot(tok::less)) {
1560 // This may be a type template being used as a template template argument.
1561 if (SS.isNotEmpty())
1562 AnnotateScopeToken(SS, !WasScopeAnnotation);
1563 return ANK_TemplateName;
1566 case Sema::NC_VarTemplate:
1567 case Sema::NC_FunctionTemplate: {
1568 // We have a type, variable or function template followed by '<'.
1571 Id.setIdentifier(Name, NameLoc);
1572 if (AnnotateTemplateIdToken(
1573 TemplateTy::make(Classification.getTemplateName()),
1574 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1579 case Sema::NC_NestedNameSpecifier:
1580 llvm_unreachable("already parsed nested name specifier");
1583 // Unable to classify the name, but maybe we can annotate a scope specifier.
1584 if (SS.isNotEmpty())
1585 AnnotateScopeToken(SS, !WasScopeAnnotation);
1586 return ANK_Unresolved;
1589 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1590 assert(Tok.isNot(tok::identifier));
1591 Diag(Tok, diag::ext_keyword_as_ident)
1592 << PP.getSpelling(Tok)
1595 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1596 Tok.setKind(tok::identifier);
1600 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1601 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1602 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1603 /// with a single annotation token representing the typename or C++ scope
1605 /// This simplifies handling of C++ scope specifiers and allows efficient
1606 /// backtracking without the need to re-parse and resolve nested-names and
1608 /// It will mainly be called when we expect to treat identifiers as typenames
1609 /// (if they are typenames). For example, in C we do not expect identifiers
1610 /// inside expressions to be treated as typenames so it will not be called
1611 /// for expressions in C.
1612 /// The benefit for C/ObjC is that a typename will be annotated and
1613 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1614 /// will not be called twice, once to check whether we have a declaration
1615 /// specifier, and another one to get the actual type inside
1616 /// ParseDeclarationSpecifiers).
1618 /// This returns true if an error occurred.
1620 /// Note that this routine emits an error if you call it with ::new or ::delete
1621 /// as the current tokens, so only call it in contexts where these are invalid.
1622 bool Parser::TryAnnotateTypeOrScopeToken() {
1623 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1624 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1625 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1626 Tok.is(tok::kw___super)) &&
1627 "Cannot be a type or scope token!");
1629 if (Tok.is(tok::kw_typename)) {
1630 // MSVC lets you do stuff like:
1631 // typename typedef T_::D D;
1633 // We will consume the typedef token here and put it back after we have
1634 // parsed the first identifier, transforming it into something more like:
1635 // typename T_::D typedef D;
1636 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1638 PP.Lex(TypedefToken);
1639 bool Result = TryAnnotateTypeOrScopeToken();
1643 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1647 // Parse a C++ typename-specifier, e.g., "typename T::type".
1649 // typename-specifier:
1650 // 'typename' '::' [opt] nested-name-specifier identifier
1651 // 'typename' '::' [opt] nested-name-specifier template [opt]
1652 // simple-template-id
1653 SourceLocation TypenameLoc = ConsumeToken();
1655 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1656 /*EnteringContext=*/false, nullptr,
1657 /*IsTypename*/ true))
1660 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1661 Tok.is(tok::annot_decltype)) {
1662 // Attempt to recover by skipping the invalid 'typename'
1663 if (Tok.is(tok::annot_decltype) ||
1664 (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1665 unsigned DiagID = diag::err_expected_qualified_after_typename;
1666 // MS compatibility: MSVC permits using known types with typename.
1667 // e.g. "typedef typename T* pointer_type"
1668 if (getLangOpts().MicrosoftExt)
1669 DiagID = diag::warn_expected_qualified_after_typename;
1670 Diag(Tok.getLocation(), DiagID);
1674 if (Tok.isEditorPlaceholder())
1677 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1682 if (Tok.is(tok::identifier)) {
1683 // FIXME: check whether the next token is '<', first!
1684 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1685 *Tok.getIdentifierInfo(),
1687 } else if (Tok.is(tok::annot_template_id)) {
1688 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1689 if (TemplateId->Kind != TNK_Type_template &&
1690 TemplateId->Kind != TNK_Dependent_template_name) {
1691 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1692 << Tok.getAnnotationRange();
1696 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1697 TemplateId->NumArgs);
1699 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1700 TemplateId->TemplateKWLoc,
1701 TemplateId->Template,
1703 TemplateId->TemplateNameLoc,
1704 TemplateId->LAngleLoc,
1706 TemplateId->RAngleLoc);
1708 Diag(Tok, diag::err_expected_type_name_after_typename)
1713 SourceLocation EndLoc = Tok.getLastLoc();
1714 Tok.setKind(tok::annot_typename);
1715 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1716 Tok.setAnnotationEndLoc(EndLoc);
1717 Tok.setLocation(TypenameLoc);
1718 PP.AnnotateCachedTokens(Tok);
1722 // Remembers whether the token was originally a scope annotation.
1723 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1726 if (getLangOpts().CPlusPlus)
1727 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
1730 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1733 /// \brief Try to annotate a type or scope token, having already parsed an
1734 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1735 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1736 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
1738 if (Tok.is(tok::identifier)) {
1739 // Determine whether the identifier is a type name.
1740 if (ParsedType Ty = Actions.getTypeName(
1741 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1742 false, NextToken().is(tok::period), nullptr,
1743 /*IsCtorOrDtorName=*/false,
1744 /*NonTrivialTypeSourceInfo*/ true,
1745 /*IsClassTemplateDeductionContext*/GreaterThanIsOperator)) {
1746 SourceLocation BeginLoc = Tok.getLocation();
1747 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1748 BeginLoc = SS.getBeginLoc();
1750 /// An Objective-C object type followed by '<' is a specialization of
1751 /// a parameterized class type or a protocol-qualified type.
1752 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1753 (Ty.get()->isObjCObjectType() ||
1754 Ty.get()->isObjCObjectPointerType())) {
1755 // Consume the name.
1756 SourceLocation IdentifierLoc = ConsumeToken();
1757 SourceLocation NewEndLoc;
1759 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1760 /*consumeLastToken=*/false,
1762 if (NewType.isUsable())
1764 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1768 // This is a typename. Replace the current token in-place with an
1769 // annotation type token.
1770 Tok.setKind(tok::annot_typename);
1771 setTypeAnnotation(Tok, Ty);
1772 Tok.setAnnotationEndLoc(Tok.getLocation());
1773 Tok.setLocation(BeginLoc);
1775 // In case the tokens were cached, have Preprocessor replace
1776 // them with the annotation token.
1777 PP.AnnotateCachedTokens(Tok);
1781 if (!getLangOpts().CPlusPlus) {
1782 // If we're in C, we can't have :: tokens at all (the lexer won't return
1783 // them). If the identifier is not a type, then it can't be scope either,
1788 // If this is a template-id, annotate with a template-id or type token.
1789 if (NextToken().is(tok::less)) {
1790 TemplateTy Template;
1791 UnqualifiedId TemplateName;
1792 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1793 bool MemberOfUnknownSpecialization;
1794 if (TemplateNameKind TNK = Actions.isTemplateName(
1796 /*hasTemplateKeyword=*/false, TemplateName,
1797 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1798 MemberOfUnknownSpecialization)) {
1799 // Consume the identifier.
1801 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1803 // If an unrecoverable error occurred, we need to return true here,
1804 // because the token stream is in a damaged state. We may not return
1805 // a valid identifier.
1811 // The current token, which is either an identifier or a
1812 // template-id, is not part of the annotation. Fall through to
1813 // push that token back into the stream and complete the C++ scope
1814 // specifier annotation.
1817 if (Tok.is(tok::annot_template_id)) {
1818 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1819 if (TemplateId->Kind == TNK_Type_template) {
1820 // A template-id that refers to a type was parsed into a
1821 // template-id annotation in a context where we weren't allowed
1822 // to produce a type annotation token. Update the template-id
1823 // annotation token to a type annotation token now.
1824 AnnotateTemplateIdTokenAsType();
1832 // A C++ scope specifier that isn't followed by a typename.
1833 AnnotateScopeToken(SS, IsNewScope);
1837 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1838 /// annotates C++ scope specifiers and template-ids. This returns
1839 /// true if there was an error that could not be recovered from.
1841 /// Note that this routine emits an error if you call it with ::new or ::delete
1842 /// as the current tokens, so only call it in contexts where these are invalid.
1843 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1844 assert(getLangOpts().CPlusPlus &&
1845 "Call sites of this function should be guarded by checking for C++");
1846 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1847 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1848 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1849 "Cannot be a type or scope token!");
1852 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1857 AnnotateScopeToken(SS, true);
1861 bool Parser::isTokenEqualOrEqualTypo() {
1862 tok::TokenKind Kind = Tok.getKind();
1866 case tok::ampequal: // &=
1867 case tok::starequal: // *=
1868 case tok::plusequal: // +=
1869 case tok::minusequal: // -=
1870 case tok::exclaimequal: // !=
1871 case tok::slashequal: // /=
1872 case tok::percentequal: // %=
1873 case tok::lessequal: // <=
1874 case tok::lesslessequal: // <<=
1875 case tok::greaterequal: // >=
1876 case tok::greatergreaterequal: // >>=
1877 case tok::caretequal: // ^=
1878 case tok::pipeequal: // |=
1879 case tok::equalequal: // ==
1880 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1882 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1889 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1890 assert(Tok.is(tok::code_completion));
1891 PrevTokLocation = Tok.getLocation();
1893 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1894 if (S->getFlags() & Scope::FnScope) {
1895 Actions.CodeCompleteOrdinaryName(getCurScope(),
1896 Sema::PCC_RecoveryInFunction);
1898 return PrevTokLocation;
1901 if (S->getFlags() & Scope::ClassScope) {
1902 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1904 return PrevTokLocation;
1908 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1910 return PrevTokLocation;
1913 // Code-completion pass-through functions
1915 void Parser::CodeCompleteDirective(bool InConditional) {
1916 Actions.CodeCompletePreprocessorDirective(InConditional);
1919 void Parser::CodeCompleteInConditionalExclusion() {
1920 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1923 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1924 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1927 void Parser::CodeCompletePreprocessorExpression() {
1928 Actions.CodeCompletePreprocessorExpression();
1931 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1932 MacroInfo *MacroInfo,
1933 unsigned ArgumentIndex) {
1934 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1938 void Parser::CodeCompleteNaturalLanguage() {
1939 Actions.CodeCompleteNaturalLanguage();
1942 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1943 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1944 "Expected '__if_exists' or '__if_not_exists'");
1945 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1946 Result.KeywordLoc = ConsumeToken();
1948 BalancedDelimiterTracker T(*this, tok::l_paren);
1949 if (T.consumeOpen()) {
1950 Diag(Tok, diag::err_expected_lparen_after)
1951 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1955 // Parse nested-name-specifier.
1956 if (getLangOpts().CPlusPlus)
1957 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1958 /*EnteringContext=*/false);
1960 // Check nested-name specifier.
1961 if (Result.SS.isInvalid()) {
1966 // Parse the unqualified-id.
1967 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1968 if (ParseUnqualifiedId(
1969 Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
1970 /*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
1971 TemplateKWLoc, Result.Name)) {
1976 if (T.consumeClose())
1979 // Check if the symbol exists.
1980 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1981 Result.IsIfExists, Result.SS,
1983 case Sema::IER_Exists:
1984 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1987 case Sema::IER_DoesNotExist:
1988 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
1991 case Sema::IER_Dependent:
1992 Result.Behavior = IEB_Dependent;
1995 case Sema::IER_Error:
2002 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2003 IfExistsCondition Result;
2004 if (ParseMicrosoftIfExistsCondition(Result))
2007 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2008 if (Braces.consumeOpen()) {
2009 Diag(Tok, diag::err_expected) << tok::l_brace;
2013 switch (Result.Behavior) {
2015 // Parse declarations below.
2019 llvm_unreachable("Cannot have a dependent external declaration");
2026 // Parse the declarations.
2027 // FIXME: Support module import within __if_exists?
2028 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2029 ParsedAttributesWithRange attrs(AttrFactory);
2030 MaybeParseCXX11Attributes(attrs);
2031 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2032 if (Result && !getCurScope()->getParent())
2033 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2035 Braces.consumeClose();
2038 /// Parse a C++ Modules TS module declaration, which appears at the beginning
2039 /// of a module interface, module partition, or module implementation file.
2041 /// module-declaration: [Modules TS + P0273R0 + P0629R0]
2042 /// 'export'[opt] 'module' 'partition'[opt]
2043 /// module-name attribute-specifier-seq[opt] ';'
2045 /// Note that 'partition' is a context-sensitive keyword.
2046 Parser::DeclGroupPtrTy Parser::ParseModuleDecl() {
2047 SourceLocation StartLoc = Tok.getLocation();
2049 Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
2050 ? Sema::ModuleDeclKind::Module
2051 : Sema::ModuleDeclKind::Implementation;
2053 assert(Tok.is(tok::kw_module) && "not a module declaration");
2054 SourceLocation ModuleLoc = ConsumeToken();
2056 if (Tok.is(tok::identifier) && NextToken().is(tok::identifier) &&
2057 Tok.getIdentifierInfo()->isStr("partition")) {
2058 // If 'partition' is present, this must be a module interface unit.
2059 if (MDK != Sema::ModuleDeclKind::Module)
2060 Diag(Tok.getLocation(), diag::err_module_implementation_partition)
2061 << FixItHint::CreateInsertion(ModuleLoc, "export ");
2062 MDK = Sema::ModuleDeclKind::Partition;
2066 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2067 if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2070 // We don't support any module attributes yet; just parse them and diagnose.
2071 ParsedAttributesWithRange Attrs(AttrFactory);
2072 MaybeParseCXX11Attributes(Attrs);
2073 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2075 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2077 return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path);
2080 /// Parse a module import declaration. This is essentially the same for
2081 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2082 /// and the trailing optional attributes (in C++).
2084 /// [ObjC] @import declaration:
2085 /// '@' 'import' module-name ';'
2086 /// [ModTS] module-import-declaration:
2087 /// 'import' module-name attribute-specifier-seq[opt] ';'
2088 Parser::DeclGroupPtrTy Parser::ParseModuleImport(SourceLocation AtLoc) {
2089 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2090 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2091 "Improper start to module import");
2092 SourceLocation ImportLoc = ConsumeToken();
2093 SourceLocation StartLoc = AtLoc.isInvalid() ? ImportLoc : AtLoc;
2095 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2096 if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2099 ParsedAttributesWithRange Attrs(AttrFactory);
2100 MaybeParseCXX11Attributes(Attrs);
2101 // We don't support any module import attributes yet.
2102 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2104 if (PP.hadModuleLoaderFatalFailure()) {
2105 // With a fatal failure in the module loader, we abort parsing.
2110 DeclResult Import = Actions.ActOnModuleImport(StartLoc, ImportLoc, Path);
2111 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2112 if (Import.isInvalid())
2115 return Actions.ConvertDeclToDeclGroup(Import.get());
2118 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2122 /// module-name-qualifier[opt] identifier
2123 /// module-name-qualifier:
2124 /// module-name-qualifier[opt] identifier '.'
2125 bool Parser::ParseModuleName(
2126 SourceLocation UseLoc,
2127 SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2129 // Parse the module path.
2131 if (!Tok.is(tok::identifier)) {
2132 if (Tok.is(tok::code_completion)) {
2133 Actions.CodeCompleteModuleImport(UseLoc, Path);
2138 Diag(Tok, diag::err_module_expected_ident) << IsImport;
2139 SkipUntil(tok::semi);
2143 // Record this part of the module path.
2144 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2147 if (Tok.isNot(tok::period))
2154 /// \brief Try recover parser when module annotation appears where it must not
2156 /// \returns false if the recover was successful and parsing may be continued, or
2157 /// true if parser must bail out to top level and handle the token there.
2158 bool Parser::parseMisplacedModuleImport() {
2160 switch (Tok.getKind()) {
2161 case tok::annot_module_end:
2162 // If we recovered from a misplaced module begin, we expect to hit a
2163 // misplaced module end too. Stay in the current context when this
2165 if (MisplacedModuleBeginCount) {
2166 --MisplacedModuleBeginCount;
2167 Actions.ActOnModuleEnd(Tok.getLocation(),
2168 reinterpret_cast<Module *>(
2169 Tok.getAnnotationValue()));
2170 ConsumeAnnotationToken();
2173 // Inform caller that recovery failed, the error must be handled at upper
2174 // level. This will generate the desired "missing '}' at end of module"
2175 // diagnostics on the way out.
2177 case tok::annot_module_begin:
2178 // Recover by entering the module (Sema will diagnose).
2179 Actions.ActOnModuleBegin(Tok.getLocation(),
2180 reinterpret_cast<Module *>(
2181 Tok.getAnnotationValue()));
2182 ConsumeAnnotationToken();
2183 ++MisplacedModuleBeginCount;
2185 case tok::annot_module_include:
2186 // Module import found where it should not be, for instance, inside a
2187 // namespace. Recover by importing the module.
2188 Actions.ActOnModuleInclude(Tok.getLocation(),
2189 reinterpret_cast<Module *>(
2190 Tok.getAnnotationValue()));
2191 ConsumeAnnotationToken();
2192 // If there is another module import, process it.
2201 bool BalancedDelimiterTracker::diagnoseOverflow() {
2202 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2203 << P.getLangOpts().BracketDepth;
2204 P.Diag(P.Tok, diag::note_bracket_depth);
2209 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2211 tok::TokenKind SkipToTok) {
2212 LOpen = P.Tok.getLocation();
2213 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2214 if (SkipToTok != tok::unknown)
2215 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2219 if (getDepth() < MaxDepth)
2222 return diagnoseOverflow();
2225 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2226 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2228 if (P.Tok.is(tok::annot_module_end))
2229 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2231 P.Diag(P.Tok, diag::err_expected) << Close;
2232 P.Diag(LOpen, diag::note_matching) << Kind;
2234 // If we're not already at some kind of closing bracket, skip to our closing
2236 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2237 P.Tok.isNot(tok::r_square) &&
2238 P.SkipUntil(Close, FinalToken,
2239 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2241 LClose = P.ConsumeAnyToken();
2245 void BalancedDelimiterTracker::skipToEnd() {
2246 P.SkipUntil(Close, Parser::StopBeforeMatch);