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 #include "llvm/Support/Path.h"
24 using namespace clang;
28 /// A comment handler that passes comments found by the preprocessor
29 /// to the parser action.
30 class ActionCommentHandler : public CommentHandler {
34 explicit ActionCommentHandler(Sema &S) : S(S) { }
36 bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
37 S.ActOnComment(Comment);
41 } // end anonymous namespace
43 IdentifierInfo *Parser::getSEHExceptKeyword() {
44 // __except is accepted as a (contextual) keyword
45 if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
46 Ident__except = PP.getIdentifierInfo("__except");
51 Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
52 : PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
53 GreaterThanIsOperator(true), ColonIsSacred(false),
54 InMessageExpression(false), TemplateParameterDepth(0),
55 ParsingInObjCContainer(false) {
56 SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
58 Tok.setKind(tok::eof);
59 Actions.CurScope = nullptr;
61 CurParsedObjCImpl = nullptr;
63 // Add #pragma handlers. These are removed and destroyed in the
65 initializePragmaHandlers();
67 CommentSemaHandler.reset(new ActionCommentHandler(actions));
68 PP.addCommentHandler(CommentSemaHandler.get());
70 PP.setCodeCompletionHandler(*this);
73 DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
74 return Diags.Report(Loc, DiagID);
77 DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
78 return Diag(Tok.getLocation(), DiagID);
81 /// Emits a diagnostic suggesting parentheses surrounding a
84 /// \param Loc The location where we'll emit the diagnostic.
85 /// \param DK The kind of diagnostic to emit.
86 /// \param ParenRange Source range enclosing code that should be parenthesized.
87 void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
88 SourceRange ParenRange) {
89 SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
90 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
91 // We can't display the parentheses, so just dig the
92 // warning/error and return.
98 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
99 << FixItHint::CreateInsertion(EndLoc, ")");
102 static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
103 switch (ExpectedTok) {
105 return Tok.is(tok::colon) || Tok.is(tok::comma); // : or , for ;
106 default: return false;
110 bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
112 if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) {
117 // Detect common single-character typos and resume.
118 if (IsCommonTypo(ExpectedTok, Tok)) {
119 SourceLocation Loc = Tok.getLocation();
121 DiagnosticBuilder DB = Diag(Loc, DiagID);
122 DB << FixItHint::CreateReplacement(
123 SourceRange(Loc), tok::getPunctuatorSpelling(ExpectedTok));
124 if (DiagID == diag::err_expected)
126 else if (DiagID == diag::err_expected_after)
127 DB << Msg << ExpectedTok;
132 // Pretend there wasn't a problem.
137 SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
138 const char *Spelling = nullptr;
139 if (EndLoc.isValid())
140 Spelling = tok::getPunctuatorSpelling(ExpectedTok);
142 DiagnosticBuilder DB =
144 ? Diag(EndLoc, DiagID) << FixItHint::CreateInsertion(EndLoc, Spelling)
146 if (DiagID == diag::err_expected)
148 else if (DiagID == diag::err_expected_after)
149 DB << Msg << ExpectedTok;
156 bool Parser::ExpectAndConsumeSemi(unsigned DiagID) {
157 if (TryConsumeToken(tok::semi))
160 if (Tok.is(tok::code_completion)) {
161 handleUnexpectedCodeCompletionToken();
165 if ((Tok.is(tok::r_paren) || Tok.is(tok::r_square)) &&
166 NextToken().is(tok::semi)) {
167 Diag(Tok, diag::err_extraneous_token_before_semi)
168 << PP.getSpelling(Tok)
169 << FixItHint::CreateRemoval(Tok.getLocation());
170 ConsumeAnyToken(); // The ')' or ']'.
171 ConsumeToken(); // The ';'.
175 return ExpectAndConsume(tok::semi, DiagID);
178 void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, unsigned TST) {
179 if (!Tok.is(tok::semi)) return;
181 bool HadMultipleSemis = false;
182 SourceLocation StartLoc = Tok.getLocation();
183 SourceLocation EndLoc = Tok.getLocation();
186 while ((Tok.is(tok::semi) && !Tok.isAtStartOfLine())) {
187 HadMultipleSemis = true;
188 EndLoc = Tok.getLocation();
192 // C++11 allows extra semicolons at namespace scope, but not in any of the
194 if (Kind == OutsideFunction && getLangOpts().CPlusPlus) {
195 if (getLangOpts().CPlusPlus11)
196 Diag(StartLoc, diag::warn_cxx98_compat_top_level_semi)
197 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
199 Diag(StartLoc, diag::ext_extra_semi_cxx11)
200 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
204 if (Kind != AfterMemberFunctionDefinition || HadMultipleSemis)
205 Diag(StartLoc, diag::ext_extra_semi)
206 << Kind << DeclSpec::getSpecifierName((DeclSpec::TST)TST,
207 Actions.getASTContext().getPrintingPolicy())
208 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
210 // A single semicolon is valid after a member function definition.
211 Diag(StartLoc, diag::warn_extra_semi_after_mem_fn_def)
212 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
215 bool Parser::expectIdentifier() {
216 if (Tok.is(tok::identifier))
218 if (const auto *II = Tok.getIdentifierInfo()) {
219 if (II->isCPlusPlusKeyword(getLangOpts())) {
220 Diag(Tok, diag::err_expected_token_instead_of_objcxx_keyword)
221 << tok::identifier << Tok.getIdentifierInfo();
222 // Objective-C++: Recover by treating this keyword as a valid identifier.
226 Diag(Tok, diag::err_expected) << tok::identifier;
230 //===----------------------------------------------------------------------===//
232 //===----------------------------------------------------------------------===//
234 static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
235 return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
238 /// SkipUntil - Read tokens until we get to the specified token, then consume
239 /// it (unless no flag StopBeforeMatch). Because we cannot guarantee that the
240 /// token will ever occur, this skips to the next token, or to some likely
241 /// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
244 /// If SkipUntil finds the specified token, it returns true, otherwise it
246 bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
247 // We always want this function to skip at least one token if the first token
248 // isn't T and if not at EOF.
249 bool isFirstTokenSkipped = true;
251 // If we found one of the tokens, stop and return true.
252 for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
253 if (Tok.is(Toks[i])) {
254 if (HasFlagsSet(Flags, StopBeforeMatch)) {
255 // Noop, don't consume the token.
263 // Important special case: The caller has given up and just wants us to
264 // skip the rest of the file. Do this without recursing, since we can
265 // get here precisely because the caller detected too much recursion.
266 if (Toks.size() == 1 && Toks[0] == tok::eof &&
267 !HasFlagsSet(Flags, StopAtSemi) &&
268 !HasFlagsSet(Flags, StopAtCodeCompletion)) {
269 while (Tok.isNot(tok::eof))
274 switch (Tok.getKind()) {
276 // Ran out of tokens.
279 case tok::annot_pragma_openmp:
280 case tok::annot_pragma_openmp_end:
281 // Stop before an OpenMP pragma boundary.
282 case tok::annot_module_begin:
283 case tok::annot_module_end:
284 case tok::annot_module_include:
285 // Stop before we change submodules. They generally indicate a "good"
286 // place to pick up parsing again (except in the special case where
287 // we're trying to skip to EOF).
290 case tok::code_completion:
291 if (!HasFlagsSet(Flags, StopAtCodeCompletion))
292 handleUnexpectedCodeCompletionToken();
296 // Recursively skip properly-nested parens.
298 if (HasFlagsSet(Flags, StopAtCodeCompletion))
299 SkipUntil(tok::r_paren, StopAtCodeCompletion);
301 SkipUntil(tok::r_paren);
304 // Recursively skip properly-nested square brackets.
306 if (HasFlagsSet(Flags, StopAtCodeCompletion))
307 SkipUntil(tok::r_square, StopAtCodeCompletion);
309 SkipUntil(tok::r_square);
312 // Recursively skip properly-nested braces.
314 if (HasFlagsSet(Flags, StopAtCodeCompletion))
315 SkipUntil(tok::r_brace, StopAtCodeCompletion);
317 SkipUntil(tok::r_brace);
320 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
321 // Since the user wasn't looking for this token (if they were, it would
322 // already be handled), this isn't balanced. If there is a LHS token at a
323 // higher level, we will assume that this matches the unbalanced token
324 // and return it. Otherwise, this is a spurious RHS token, which we skip.
326 if (ParenCount && !isFirstTokenSkipped)
327 return false; // Matches something.
331 if (BracketCount && !isFirstTokenSkipped)
332 return false; // Matches something.
336 if (BraceCount && !isFirstTokenSkipped)
337 return false; // Matches something.
342 if (HasFlagsSet(Flags, StopAtSemi))
350 isFirstTokenSkipped = false;
354 //===----------------------------------------------------------------------===//
355 // Scope manipulation
356 //===----------------------------------------------------------------------===//
358 /// EnterScope - Start a new scope.
359 void Parser::EnterScope(unsigned ScopeFlags) {
360 if (NumCachedScopes) {
361 Scope *N = ScopeCache[--NumCachedScopes];
362 N->Init(getCurScope(), ScopeFlags);
363 Actions.CurScope = N;
365 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
369 /// ExitScope - Pop a scope off the scope stack.
370 void Parser::ExitScope() {
371 assert(getCurScope() && "Scope imbalance!");
373 // Inform the actions module that this scope is going away if there are any
375 Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
377 Scope *OldScope = getCurScope();
378 Actions.CurScope = OldScope->getParent();
380 if (NumCachedScopes == ScopeCacheSize)
383 ScopeCache[NumCachedScopes++] = OldScope;
386 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
387 /// this object does nothing.
388 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
390 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
392 OldFlags = CurScope->getFlags();
393 CurScope->setFlags(ScopeFlags);
397 /// Restore the flags for the current scope to what they were before this
398 /// object overrode them.
399 Parser::ParseScopeFlags::~ParseScopeFlags() {
401 CurScope->setFlags(OldFlags);
405 //===----------------------------------------------------------------------===//
406 // C99 6.9: External Definitions.
407 //===----------------------------------------------------------------------===//
410 // If we still have scopes active, delete the scope tree.
411 delete getCurScope();
412 Actions.CurScope = nullptr;
414 // Free the scope cache.
415 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
416 delete ScopeCache[i];
418 resetPragmaHandlers();
420 PP.removeCommentHandler(CommentSemaHandler.get());
422 PP.clearCodeCompletionHandler();
424 if (getLangOpts().DelayedTemplateParsing &&
425 !PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
426 // If an ASTConsumer parsed delay-parsed templates in their
427 // HandleTranslationUnit() method, TemplateIds created there were not
428 // guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
429 // ParseTopLevelDecl(). Destroy them here.
430 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
433 assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
436 /// Initialize - Warm up the parser.
438 void Parser::Initialize() {
439 // Create the translation unit scope. Install it as the current scope.
440 assert(getCurScope() == nullptr && "A scope is already active?");
441 EnterScope(Scope::DeclScope);
442 Actions.ActOnTranslationUnitScope(getCurScope());
444 // Initialization for Objective-C context sensitive keywords recognition.
445 // Referenced in Parser::ParseObjCTypeQualifierList.
446 if (getLangOpts().ObjC1) {
447 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
448 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
449 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
450 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
451 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
452 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
453 ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
454 ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
455 ObjCTypeQuals[objc_null_unspecified]
456 = &PP.getIdentifierTable().get("null_unspecified");
459 Ident_instancetype = nullptr;
460 Ident_final = nullptr;
461 Ident_sealed = nullptr;
462 Ident_override = nullptr;
463 Ident_GNU_final = nullptr;
465 Ident_super = &PP.getIdentifierTable().get("super");
467 Ident_vector = nullptr;
468 Ident_bool = nullptr;
469 Ident_pixel = nullptr;
470 if (getLangOpts().AltiVec || getLangOpts().ZVector) {
471 Ident_vector = &PP.getIdentifierTable().get("vector");
472 Ident_bool = &PP.getIdentifierTable().get("bool");
474 if (getLangOpts().AltiVec)
475 Ident_pixel = &PP.getIdentifierTable().get("pixel");
477 Ident_introduced = nullptr;
478 Ident_deprecated = nullptr;
479 Ident_obsoleted = nullptr;
480 Ident_unavailable = nullptr;
481 Ident_strict = nullptr;
482 Ident_replacement = nullptr;
484 Ident_language = Ident_defined_in = Ident_generated_declaration = nullptr;
486 Ident__except = nullptr;
488 Ident__exception_code = Ident__exception_info = nullptr;
489 Ident__abnormal_termination = Ident___exception_code = nullptr;
490 Ident___exception_info = Ident___abnormal_termination = nullptr;
491 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
492 Ident_AbnormalTermination = nullptr;
494 if(getLangOpts().Borland) {
495 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
496 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
497 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
498 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
499 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
500 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
501 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
502 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
503 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
505 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
506 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
507 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
508 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
509 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
510 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
511 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
512 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
513 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
516 Actions.Initialize();
518 // Prime the lexer look-ahead.
522 void Parser::LateTemplateParserCleanupCallback(void *P) {
523 // While this RAII helper doesn't bracket any actual work, the destructor will
524 // clean up annotations that were created during ActOnEndOfTranslationUnit
525 // when incremental processing is enabled.
526 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
529 bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result) {
530 Actions.ActOnStartOfTranslationUnit();
532 // C11 6.9p1 says translation units must have at least one top-level
533 // declaration. C++ doesn't have this restriction. We also don't want to
534 // complain if we have a precompiled header, although technically if the PCH
535 // is empty we should still emit the (pedantic) diagnostic.
536 bool NoTopLevelDecls = ParseTopLevelDecl(Result);
537 if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
538 !getLangOpts().CPlusPlus)
539 Diag(diag::ext_empty_translation_unit);
541 return NoTopLevelDecls;
544 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
545 /// action tells us to. This returns true if the EOF was encountered.
546 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
547 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
549 // Skip over the EOF token, flagging end of previous input for incremental
551 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
555 switch (Tok.getKind()) {
556 case tok::annot_pragma_unused:
557 HandlePragmaUnused();
561 if (NextToken().isNot(tok::kw_module))
565 Result = ParseModuleDecl();
568 case tok::annot_module_include:
569 Actions.ActOnModuleInclude(Tok.getLocation(),
570 reinterpret_cast<Module *>(
571 Tok.getAnnotationValue()));
572 ConsumeAnnotationToken();
575 case tok::annot_module_begin:
576 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
577 Tok.getAnnotationValue()));
578 ConsumeAnnotationToken();
581 case tok::annot_module_end:
582 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
583 Tok.getAnnotationValue()));
584 ConsumeAnnotationToken();
587 case tok::annot_pragma_attribute:
588 HandlePragmaAttribute();
592 // Late template parsing can begin.
593 if (getLangOpts().DelayedTemplateParsing)
594 Actions.SetLateTemplateParser(LateTemplateParserCallback,
595 PP.isIncrementalProcessingEnabled() ?
596 LateTemplateParserCleanupCallback : nullptr,
598 if (!PP.isIncrementalProcessingEnabled())
599 Actions.ActOnEndOfTranslationUnit();
600 //else don't tell Sema that we ended parsing: more input might come.
607 ParsedAttributesWithRange attrs(AttrFactory);
608 MaybeParseCXX11Attributes(attrs);
610 Result = ParseExternalDeclaration(attrs);
614 /// ParseExternalDeclaration:
616 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
617 /// function-definition
619 /// [GNU] asm-definition
620 /// [GNU] __extension__ external-declaration
621 /// [OBJC] objc-class-definition
622 /// [OBJC] objc-class-declaration
623 /// [OBJC] objc-alias-declaration
624 /// [OBJC] objc-protocol-definition
625 /// [OBJC] objc-method-definition
627 /// [C++] linkage-specification
628 /// [GNU] asm-definition:
629 /// simple-asm-expr ';'
630 /// [C++11] empty-declaration
631 /// [C++11] attribute-declaration
633 /// [C++11] empty-declaration:
636 /// [C++0x/GNU] 'extern' 'template' declaration
638 /// [Modules-TS] module-import-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.
702 Actions.ActOnEmptyDeclaration(getCurScope(), attrs, Tok.getLocation());
703 ConsumeExtraSemi(OutsideFunction);
706 Diag(Tok, diag::err_extraneous_closing_brace);
710 Diag(Tok, diag::err_expected_external_declaration);
712 case tok::kw___extension__: {
713 // __extension__ silences extension warnings in the subexpression.
714 ExtensionRAIIObject O(Diags); // Use RAII to do this.
716 return ParseExternalDeclaration(attrs);
719 ProhibitAttributes(attrs);
721 SourceLocation StartLoc = Tok.getLocation();
722 SourceLocation EndLoc;
724 ExprResult Result(ParseSimpleAsm(&EndLoc));
726 // Check if GNU-style InlineAsm is disabled.
727 // Empty asm string is allowed because it will not introduce
728 // any assembly code.
729 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
730 const auto *SL = cast<StringLiteral>(Result.get());
731 if (!SL->getString().trim().empty())
732 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
735 ExpectAndConsume(tok::semi, diag::err_expected_after,
736 "top-level asm block");
738 if (Result.isInvalid())
740 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
744 return ParseObjCAtDirectives(attrs);
747 if (!getLangOpts().ObjC1) {
748 Diag(Tok, diag::err_expected_external_declaration);
752 SingleDecl = ParseObjCMethodDefinition();
754 case tok::code_completion:
755 if (CurParsedObjCImpl) {
756 // Code-complete Objective-C methods even without leading '-'/'+' prefix.
757 Actions.CodeCompleteObjCMethodDecl(getCurScope(),
758 /*IsInstanceMethod=*/None,
759 /*ReturnType=*/nullptr);
761 Actions.CodeCompleteOrdinaryName(
763 CurParsedObjCImpl ? Sema::PCC_ObjCImplementation : Sema::PCC_Namespace);
767 SingleDecl = ParseModuleImport(SourceLocation());
770 if (getLangOpts().ModulesTS) {
771 SingleDecl = ParseExportDeclaration();
774 // This must be 'export template'. Parse it so we can diagnose our lack
778 case tok::kw_namespace:
779 case tok::kw_typedef:
780 case tok::kw_template:
781 case tok::kw_static_assert:
782 case tok::kw__Static_assert:
783 // A function definition cannot start with any of these keywords.
785 SourceLocation DeclEnd;
786 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
790 // Parse (then ignore) 'static' prior to a template instantiation. This is
791 // a GCC extension that we intentionally do not support.
792 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
793 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
795 SourceLocation DeclEnd;
796 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
801 if (getLangOpts().CPlusPlus) {
802 tok::TokenKind NextKind = NextToken().getKind();
804 // Inline namespaces. Allowed as an extension even in C++03.
805 if (NextKind == tok::kw_namespace) {
806 SourceLocation DeclEnd;
807 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
810 // Parse (then ignore) 'inline' prior to a template instantiation. This is
811 // a GCC extension that we intentionally do not support.
812 if (NextKind == tok::kw_template) {
813 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
815 SourceLocation DeclEnd;
816 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
822 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
824 SourceLocation ExternLoc = ConsumeToken();
825 SourceLocation TemplateLoc = ConsumeToken();
826 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
827 diag::warn_cxx98_compat_extern_template :
828 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
829 SourceLocation DeclEnd;
830 return Actions.ConvertDeclToDeclGroup(
831 ParseExplicitInstantiation(DeclaratorContext::FileContext, ExternLoc,
832 TemplateLoc, DeclEnd, attrs));
836 case tok::kw___if_exists:
837 case tok::kw___if_not_exists:
838 ParseMicrosoftIfExistsExternalDeclaration();
842 Diag(Tok, diag::err_unexpected_module_decl);
843 SkipUntil(tok::semi);
848 if (Tok.isEditorPlaceholder()) {
852 // We can't tell whether this is a function-definition or declaration yet.
853 return ParseDeclarationOrFunctionDefinition(attrs, DS);
856 // This routine returns a DeclGroup, if the thing we parsed only contains a
857 // single decl, convert it now.
858 return Actions.ConvertDeclToDeclGroup(SingleDecl);
861 /// Determine whether the current token, if it occurs after a
862 /// declarator, continues a declaration or declaration list.
863 bool Parser::isDeclarationAfterDeclarator() {
864 // Check for '= delete' or '= default'
865 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
866 const Token &KW = NextToken();
867 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
871 return Tok.is(tok::equal) || // int X()= -> not a function def
872 Tok.is(tok::comma) || // int X(), -> not a function def
873 Tok.is(tok::semi) || // int X(); -> not a function def
874 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
875 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
876 (getLangOpts().CPlusPlus &&
877 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
880 /// Determine whether the current token, if it occurs after a
881 /// declarator, indicates the start of a function definition.
882 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
883 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
884 if (Tok.is(tok::l_brace)) // int X() {}
887 // Handle K&R C argument lists: int X(f) int f; {}
888 if (!getLangOpts().CPlusPlus &&
889 Declarator.getFunctionTypeInfo().isKNRPrototype())
890 return isDeclarationSpecifier();
892 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
893 const Token &KW = NextToken();
894 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
897 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
898 Tok.is(tok::kw_try); // X() try { ... }
901 /// Parse either a function-definition or a declaration. We can't tell which
902 /// we have until we read up to the compound-statement in function-definition.
903 /// TemplateParams, if non-NULL, provides the template parameters when we're
904 /// parsing a C++ template-declaration.
906 /// function-definition: [C99 6.9.1]
907 /// decl-specs declarator declaration-list[opt] compound-statement
908 /// [C90] function-definition: [C99 6.7.1] - implicit int result
909 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
911 /// declaration: [C99 6.7]
912 /// declaration-specifiers init-declarator-list[opt] ';'
913 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
914 /// [OMP] threadprivate-directive [TODO]
916 Parser::DeclGroupPtrTy
917 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
919 AccessSpecifier AS) {
920 MaybeParseMicrosoftAttributes(DS.getAttributes());
921 // Parse the common declaration-specifiers piece.
922 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS,
923 DeclSpecContext::DSC_top_level);
925 // If we had a free-standing type definition with a missing semicolon, we
926 // may get this far before the problem becomes obvious.
927 if (DS.hasTagDefinition() && DiagnoseMissingSemiAfterTagDefinition(
928 DS, AS, DeclSpecContext::DSC_top_level))
931 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
932 // declaration-specifiers init-declarator-list[opt] ';'
933 if (Tok.is(tok::semi)) {
934 auto LengthOfTSTToken = [](DeclSpec::TST TKind) {
935 assert(DeclSpec::isDeclRep(TKind));
937 case DeclSpec::TST_class:
939 case DeclSpec::TST_struct:
941 case DeclSpec::TST_union:
943 case DeclSpec::TST_enum:
945 case DeclSpec::TST_interface:
948 llvm_unreachable("we only expect to get the length of the class/struct/union/enum");
952 // Suggest correct location to fix '[[attrib]] struct' to 'struct [[attrib]]'
953 SourceLocation CorrectLocationForAttributes =
954 DeclSpec::isDeclRep(DS.getTypeSpecType())
955 ? DS.getTypeSpecTypeLoc().getLocWithOffset(
956 LengthOfTSTToken(DS.getTypeSpecType()))
958 ProhibitAttributes(attrs, CorrectLocationForAttributes);
960 RecordDecl *AnonRecord = nullptr;
961 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
963 DS.complete(TheDecl);
964 if (getLangOpts().OpenCL)
965 Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
967 Decl* decls[] = {AnonRecord, TheDecl};
968 return Actions.BuildDeclaratorGroup(decls);
970 return Actions.ConvertDeclToDeclGroup(TheDecl);
973 DS.takeAttributesFrom(attrs);
975 // ObjC2 allows prefix attributes on class interfaces and protocols.
976 // FIXME: This still needs better diagnostics. We should only accept
977 // attributes here, no types, etc.
978 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
979 SourceLocation AtLoc = ConsumeToken(); // the "@"
980 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
981 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
982 Diag(Tok, diag::err_objc_unexpected_attr);
983 SkipUntil(tok::semi); // FIXME: better skip?
989 const char *PrevSpec = nullptr;
991 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
992 Actions.getASTContext().getPrintingPolicy()))
993 Diag(AtLoc, DiagID) << PrevSpec;
995 if (Tok.isObjCAtKeyword(tok::objc_protocol))
996 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
998 return Actions.ConvertDeclToDeclGroup(
999 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
1002 // If the declspec consisted only of 'extern' and we have a string
1003 // literal following it, this must be a C++ linkage specifier like
1005 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
1006 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
1007 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
1008 Decl *TheDecl = ParseLinkage(DS, DeclaratorContext::FileContext);
1009 return Actions.ConvertDeclToDeclGroup(TheDecl);
1012 return ParseDeclGroup(DS, DeclaratorContext::FileContext);
1015 Parser::DeclGroupPtrTy
1016 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
1017 ParsingDeclSpec *DS,
1018 AccessSpecifier AS) {
1020 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
1022 ParsingDeclSpec PDS(*this);
1023 // Must temporarily exit the objective-c container scope for
1024 // parsing c constructs and re-enter objc container scope
1026 ObjCDeclContextSwitch ObjCDC(*this);
1028 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
1032 /// ParseFunctionDefinition - We parsed and verified that the specified
1033 /// Declarator is well formed. If this is a K&R-style function, read the
1034 /// parameters declaration-list, then start the compound-statement.
1036 /// function-definition: [C99 6.9.1]
1037 /// decl-specs declarator declaration-list[opt] compound-statement
1038 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1039 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1040 /// [C++] function-definition: [C++ 8.4]
1041 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1043 /// [C++] function-definition: [C++ 8.4]
1044 /// decl-specifier-seq[opt] declarator function-try-block
1046 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1047 const ParsedTemplateInfo &TemplateInfo,
1048 LateParsedAttrList *LateParsedAttrs) {
1049 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1050 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1051 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1053 // If this is C90 and the declspecs were completely missing, fudge in an
1054 // implicit int. We do this here because this is the only place where
1055 // declaration-specifiers are completely optional in the grammar.
1056 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1057 const char *PrevSpec;
1059 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1060 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
1061 D.getIdentifierLoc(),
1064 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1067 // If this declaration was formed with a K&R-style identifier list for the
1068 // arguments, parse declarations for all of the args next.
1069 // int foo(a,b) int a; float b; {}
1070 if (FTI.isKNRPrototype())
1071 ParseKNRParamDeclarations(D);
1073 // We should have either an opening brace or, in a C++ constructor,
1074 // we may have a colon.
1075 if (Tok.isNot(tok::l_brace) &&
1076 (!getLangOpts().CPlusPlus ||
1077 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1078 Tok.isNot(tok::equal)))) {
1079 Diag(Tok, diag::err_expected_fn_body);
1081 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1082 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1084 // If we didn't find the '{', bail out.
1085 if (Tok.isNot(tok::l_brace))
1089 // Check to make sure that any normal attributes are allowed to be on
1090 // a definition. Late parsed attributes are checked at the end.
1091 if (Tok.isNot(tok::equal)) {
1092 for (const ParsedAttr &AL : D.getAttributes())
1093 if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
1094 Diag(AL.getLoc(), diag::warn_attribute_on_function_definition)
1098 // In delayed template parsing mode, for function template we consume the
1099 // tokens and store them for late parsing at the end of the translation unit.
1100 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1101 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1102 Actions.canDelayFunctionBody(D)) {
1103 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1105 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1106 Scope::CompoundStmtScope);
1107 Scope *ParentScope = getCurScope()->getParent();
1109 D.setFunctionDefinitionKind(FDK_Definition);
1110 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1111 TemplateParameterLists);
1113 D.getMutableDeclSpec().abort();
1115 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1116 trySkippingFunctionBody()) {
1118 return Actions.ActOnSkippedFunctionBody(DP);
1122 LexTemplateFunctionForLateParsing(Toks);
1125 FunctionDecl *FnD = DP->getAsFunction();
1126 Actions.CheckForFunctionRedefinition(FnD);
1127 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1131 else if (CurParsedObjCImpl &&
1132 !TemplateInfo.TemplateParams &&
1133 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1134 Tok.is(tok::colon)) &&
1135 Actions.CurContext->isTranslationUnit()) {
1136 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1137 Scope::CompoundStmtScope);
1138 Scope *ParentScope = getCurScope()->getParent();
1140 D.setFunctionDefinitionKind(FDK_Definition);
1141 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1142 MultiTemplateParamsArg());
1143 D.complete(FuncDecl);
1144 D.getMutableDeclSpec().abort();
1146 // Consume the tokens and store them for later parsing.
1147 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1148 CurParsedObjCImpl->HasCFunction = true;
1151 // FIXME: Should we really fall through here?
1154 // Enter a scope for the function body.
1155 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1156 Scope::CompoundStmtScope);
1158 // Tell the actions module that we have entered a function definition with the
1159 // specified Declarator for the function.
1160 Sema::SkipBodyInfo SkipBody;
1161 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1162 TemplateInfo.TemplateParams
1163 ? *TemplateInfo.TemplateParams
1164 : MultiTemplateParamsArg(),
1167 if (SkipBody.ShouldSkip) {
1172 // Break out of the ParsingDeclarator context before we parse the body.
1175 // Break out of the ParsingDeclSpec context, too. This const_cast is
1176 // safe because we're always the sole owner.
1177 D.getMutableDeclSpec().abort();
1179 if (TryConsumeToken(tok::equal)) {
1180 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1182 bool Delete = false;
1183 SourceLocation KWLoc;
1184 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1185 Diag(KWLoc, getLangOpts().CPlusPlus11
1186 ? diag::warn_cxx98_compat_defaulted_deleted_function
1187 : diag::ext_defaulted_deleted_function)
1189 Actions.SetDeclDeleted(Res, KWLoc);
1191 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1192 Diag(KWLoc, getLangOpts().CPlusPlus11
1193 ? diag::warn_cxx98_compat_defaulted_deleted_function
1194 : diag::ext_defaulted_deleted_function)
1195 << 0 /* defaulted */;
1196 Actions.SetDeclDefaulted(Res, KWLoc);
1198 llvm_unreachable("function definition after = not 'delete' or 'default'");
1201 if (Tok.is(tok::comma)) {
1202 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1204 SkipUntil(tok::semi);
1205 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1206 Delete ? "delete" : "default")) {
1207 SkipUntil(tok::semi);
1210 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1211 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1215 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1216 trySkippingFunctionBody()) {
1218 Actions.ActOnSkippedFunctionBody(Res);
1219 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1222 if (Tok.is(tok::kw_try))
1223 return ParseFunctionTryBlock(Res, BodyScope);
1225 // If we have a colon, then we're probably parsing a C++
1226 // ctor-initializer.
1227 if (Tok.is(tok::colon)) {
1228 ParseConstructorInitializer(Res);
1230 // Recover from error.
1231 if (!Tok.is(tok::l_brace)) {
1233 Actions.ActOnFinishFunctionBody(Res, nullptr);
1237 Actions.ActOnDefaultCtorInitializers(Res);
1239 // Late attributes are parsed in the same scope as the function body.
1240 if (LateParsedAttrs)
1241 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1243 return ParseFunctionStatementBody(Res, BodyScope);
1246 void Parser::SkipFunctionBody() {
1247 if (Tok.is(tok::equal)) {
1248 SkipUntil(tok::semi);
1252 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1253 if (IsFunctionTryBlock)
1256 CachedTokens Skipped;
1257 if (ConsumeAndStoreFunctionPrologue(Skipped))
1258 SkipMalformedDecl();
1260 SkipUntil(tok::r_brace);
1261 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1262 SkipUntil(tok::l_brace);
1263 SkipUntil(tok::r_brace);
1268 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1269 /// types for a function with a K&R-style identifier list for arguments.
1270 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1271 // We know that the top-level of this declarator is a function.
1272 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1274 // Enter function-declaration scope, limiting any declarators to the
1275 // function prototype scope, including parameter declarators.
1276 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1277 Scope::FunctionDeclarationScope | Scope::DeclScope);
1279 // Read all the argument declarations.
1280 while (isDeclarationSpecifier()) {
1281 SourceLocation DSStart = Tok.getLocation();
1283 // Parse the common declaration-specifiers piece.
1284 DeclSpec DS(AttrFactory);
1285 ParseDeclarationSpecifiers(DS);
1287 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1288 // least one declarator'.
1289 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1290 // the declarations though. It's trivial to ignore them, really hard to do
1291 // anything else with them.
1292 if (TryConsumeToken(tok::semi)) {
1293 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1297 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1299 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1300 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1301 Diag(DS.getStorageClassSpecLoc(),
1302 diag::err_invalid_storage_class_in_func_decl);
1303 DS.ClearStorageClassSpecs();
1305 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1306 Diag(DS.getThreadStorageClassSpecLoc(),
1307 diag::err_invalid_storage_class_in_func_decl);
1308 DS.ClearStorageClassSpecs();
1311 // Parse the first declarator attached to this declspec.
1312 Declarator ParmDeclarator(DS, DeclaratorContext::KNRTypeListContext);
1313 ParseDeclarator(ParmDeclarator);
1315 // Handle the full declarator list.
1317 // If attributes are present, parse them.
1318 MaybeParseGNUAttributes(ParmDeclarator);
1320 // Ask the actions module to compute the type for this declarator.
1322 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1325 // A missing identifier has already been diagnosed.
1326 ParmDeclarator.getIdentifier()) {
1328 // Scan the argument list looking for the correct param to apply this
1330 for (unsigned i = 0; ; ++i) {
1331 // C99 6.9.1p6: those declarators shall declare only identifiers from
1332 // the identifier list.
1333 if (i == FTI.NumParams) {
1334 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1335 << ParmDeclarator.getIdentifier();
1339 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1340 // Reject redefinitions of parameters.
1341 if (FTI.Params[i].Param) {
1342 Diag(ParmDeclarator.getIdentifierLoc(),
1343 diag::err_param_redefinition)
1344 << ParmDeclarator.getIdentifier();
1346 FTI.Params[i].Param = Param;
1353 // If we don't have a comma, it is either the end of the list (a ';') or
1354 // an error, bail out.
1355 if (Tok.isNot(tok::comma))
1358 ParmDeclarator.clear();
1360 // Consume the comma.
1361 ParmDeclarator.setCommaLoc(ConsumeToken());
1363 // Parse the next declarator.
1364 ParseDeclarator(ParmDeclarator);
1367 // Consume ';' and continue parsing.
1368 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1371 // Otherwise recover by skipping to next semi or mandatory function body.
1372 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1374 TryConsumeToken(tok::semi);
1377 // The actions module must verify that all arguments were declared.
1378 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1382 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1383 /// allowed to be a wide string, and is not subject to character translation.
1385 /// [GNU] asm-string-literal:
1388 ExprResult Parser::ParseAsmStringLiteral() {
1389 if (!isTokenStringLiteral()) {
1390 Diag(Tok, diag::err_expected_string_literal)
1391 << /*Source='in...'*/0 << "'asm'";
1395 ExprResult AsmString(ParseStringLiteralExpression());
1396 if (!AsmString.isInvalid()) {
1397 const auto *SL = cast<StringLiteral>(AsmString.get());
1398 if (!SL->isAscii()) {
1399 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1401 << SL->getSourceRange();
1410 /// [GNU] simple-asm-expr:
1411 /// 'asm' '(' asm-string-literal ')'
1413 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1414 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1415 SourceLocation Loc = ConsumeToken();
1417 if (Tok.is(tok::kw_volatile)) {
1418 // Remove from the end of 'asm' to the end of 'volatile'.
1419 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1420 PP.getLocForEndOfToken(Tok.getLocation()));
1422 Diag(Tok, diag::warn_file_asm_volatile)
1423 << FixItHint::CreateRemoval(RemovalRange);
1427 BalancedDelimiterTracker T(*this, tok::l_paren);
1428 if (T.consumeOpen()) {
1429 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1433 ExprResult Result(ParseAsmStringLiteral());
1435 if (!Result.isInvalid()) {
1436 // Close the paren and get the location of the end bracket
1439 *EndLoc = T.getCloseLocation();
1440 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1442 *EndLoc = Tok.getLocation();
1449 /// Get the TemplateIdAnnotation from the token and put it in the
1450 /// cleanup pool so that it gets destroyed when parsing the current top level
1451 /// declaration is finished.
1452 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1453 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1454 TemplateIdAnnotation *
1455 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1459 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1460 // Push the current token back into the token stream (or revert it if it is
1461 // cached) and use an annotation scope token for current token.
1462 if (PP.isBacktrackEnabled())
1463 PP.RevertCachedTokens(1);
1466 Tok.setKind(tok::annot_cxxscope);
1467 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1468 Tok.setAnnotationRange(SS.getRange());
1470 // In case the tokens were cached, have Preprocessor replace them
1471 // with the annotation token. We don't need to do this if we've
1472 // just reverted back to a prior state.
1473 if (IsNewAnnotation)
1474 PP.AnnotateCachedTokens(Tok);
1477 /// Attempt to classify the name at the current token position. This may
1478 /// form a type, scope or primary expression annotation, or replace the token
1479 /// with a typo-corrected keyword. This is only appropriate when the current
1480 /// name must refer to an entity which has already been declared.
1482 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1483 /// and might possibly have a dependent nested name specifier.
1484 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1485 /// no typo correction will be performed.
1486 Parser::AnnotatedNameKind
1487 Parser::TryAnnotateName(bool IsAddressOfOperand,
1488 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1489 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1491 const bool EnteringContext = false;
1492 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1495 if (getLangOpts().CPlusPlus &&
1496 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1499 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1500 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1502 return ANK_Unresolved;
1505 IdentifierInfo *Name = Tok.getIdentifierInfo();
1506 SourceLocation NameLoc = Tok.getLocation();
1508 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1509 // typo-correct to tentatively-declared identifiers.
1510 if (isTentativelyDeclared(Name)) {
1511 // Identifier has been tentatively declared, and thus cannot be resolved as
1512 // an expression. Fall back to annotating it as a type.
1513 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1515 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1518 Token Next = NextToken();
1520 // Look up and classify the identifier. We don't perform any typo-correction
1521 // after a scope specifier, because in general we can't recover from typos
1522 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1523 // jump back into scope specifier parsing).
1524 Sema::NameClassification Classification = Actions.ClassifyName(
1525 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1526 SS.isEmpty() ? std::move(CCC) : nullptr);
1528 switch (Classification.getKind()) {
1529 case Sema::NC_Error:
1532 case Sema::NC_Keyword:
1533 // The identifier was typo-corrected to a keyword.
1534 Tok.setIdentifierInfo(Name);
1535 Tok.setKind(Name->getTokenID());
1536 PP.TypoCorrectToken(Tok);
1537 if (SS.isNotEmpty())
1538 AnnotateScopeToken(SS, !WasScopeAnnotation);
1539 // We've "annotated" this as a keyword.
1542 case Sema::NC_Unknown:
1543 // It's not something we know about. Leave it unannotated.
1546 case Sema::NC_Type: {
1547 SourceLocation BeginLoc = NameLoc;
1548 if (SS.isNotEmpty())
1549 BeginLoc = SS.getBeginLoc();
1551 /// An Objective-C object type followed by '<' is a specialization of
1552 /// a parameterized class type or a protocol-qualified type.
1553 ParsedType Ty = Classification.getType();
1554 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1555 (Ty.get()->isObjCObjectType() ||
1556 Ty.get()->isObjCObjectPointerType())) {
1557 // Consume the name.
1558 SourceLocation IdentifierLoc = ConsumeToken();
1559 SourceLocation NewEndLoc;
1561 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1562 /*consumeLastToken=*/false,
1564 if (NewType.isUsable())
1566 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1570 Tok.setKind(tok::annot_typename);
1571 setTypeAnnotation(Tok, Ty);
1572 Tok.setAnnotationEndLoc(Tok.getLocation());
1573 Tok.setLocation(BeginLoc);
1574 PP.AnnotateCachedTokens(Tok);
1578 case Sema::NC_Expression:
1579 Tok.setKind(tok::annot_primary_expr);
1580 setExprAnnotation(Tok, Classification.getExpression());
1581 Tok.setAnnotationEndLoc(NameLoc);
1582 if (SS.isNotEmpty())
1583 Tok.setLocation(SS.getBeginLoc());
1584 PP.AnnotateCachedTokens(Tok);
1587 case Sema::NC_TypeTemplate:
1588 if (Next.isNot(tok::less)) {
1589 // This may be a type template being used as a template template argument.
1590 if (SS.isNotEmpty())
1591 AnnotateScopeToken(SS, !WasScopeAnnotation);
1592 return ANK_TemplateName;
1595 case Sema::NC_VarTemplate:
1596 case Sema::NC_FunctionTemplate: {
1597 // We have a type, variable or function template followed by '<'.
1600 Id.setIdentifier(Name, NameLoc);
1601 if (AnnotateTemplateIdToken(
1602 TemplateTy::make(Classification.getTemplateName()),
1603 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1608 case Sema::NC_NestedNameSpecifier:
1609 llvm_unreachable("already parsed nested name specifier");
1612 // Unable to classify the name, but maybe we can annotate a scope specifier.
1613 if (SS.isNotEmpty())
1614 AnnotateScopeToken(SS, !WasScopeAnnotation);
1615 return ANK_Unresolved;
1618 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1619 assert(Tok.isNot(tok::identifier));
1620 Diag(Tok, diag::ext_keyword_as_ident)
1621 << PP.getSpelling(Tok)
1624 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1625 Tok.setKind(tok::identifier);
1629 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1630 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1631 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1632 /// with a single annotation token representing the typename or C++ scope
1634 /// This simplifies handling of C++ scope specifiers and allows efficient
1635 /// backtracking without the need to re-parse and resolve nested-names and
1637 /// It will mainly be called when we expect to treat identifiers as typenames
1638 /// (if they are typenames). For example, in C we do not expect identifiers
1639 /// inside expressions to be treated as typenames so it will not be called
1640 /// for expressions in C.
1641 /// The benefit for C/ObjC is that a typename will be annotated and
1642 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1643 /// will not be called twice, once to check whether we have a declaration
1644 /// specifier, and another one to get the actual type inside
1645 /// ParseDeclarationSpecifiers).
1647 /// This returns true if an error occurred.
1649 /// Note that this routine emits an error if you call it with ::new or ::delete
1650 /// as the current tokens, so only call it in contexts where these are invalid.
1651 bool Parser::TryAnnotateTypeOrScopeToken() {
1652 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1653 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1654 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1655 Tok.is(tok::kw___super)) &&
1656 "Cannot be a type or scope token!");
1658 if (Tok.is(tok::kw_typename)) {
1659 // MSVC lets you do stuff like:
1660 // typename typedef T_::D D;
1662 // We will consume the typedef token here and put it back after we have
1663 // parsed the first identifier, transforming it into something more like:
1664 // typename T_::D typedef D;
1665 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1667 PP.Lex(TypedefToken);
1668 bool Result = TryAnnotateTypeOrScopeToken();
1672 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1676 // Parse a C++ typename-specifier, e.g., "typename T::type".
1678 // typename-specifier:
1679 // 'typename' '::' [opt] nested-name-specifier identifier
1680 // 'typename' '::' [opt] nested-name-specifier template [opt]
1681 // simple-template-id
1682 SourceLocation TypenameLoc = ConsumeToken();
1684 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1685 /*EnteringContext=*/false, nullptr,
1686 /*IsTypename*/ true))
1689 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1690 Tok.is(tok::annot_decltype)) {
1691 // Attempt to recover by skipping the invalid 'typename'
1692 if (Tok.is(tok::annot_decltype) ||
1693 (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1694 unsigned DiagID = diag::err_expected_qualified_after_typename;
1695 // MS compatibility: MSVC permits using known types with typename.
1696 // e.g. "typedef typename T* pointer_type"
1697 if (getLangOpts().MicrosoftExt)
1698 DiagID = diag::warn_expected_qualified_after_typename;
1699 Diag(Tok.getLocation(), DiagID);
1703 if (Tok.isEditorPlaceholder())
1706 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1711 if (Tok.is(tok::identifier)) {
1712 // FIXME: check whether the next token is '<', first!
1713 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1714 *Tok.getIdentifierInfo(),
1716 } else if (Tok.is(tok::annot_template_id)) {
1717 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1718 if (TemplateId->Kind != TNK_Type_template &&
1719 TemplateId->Kind != TNK_Dependent_template_name) {
1720 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1721 << Tok.getAnnotationRange();
1725 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1726 TemplateId->NumArgs);
1728 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1729 TemplateId->TemplateKWLoc,
1730 TemplateId->Template,
1732 TemplateId->TemplateNameLoc,
1733 TemplateId->LAngleLoc,
1735 TemplateId->RAngleLoc);
1737 Diag(Tok, diag::err_expected_type_name_after_typename)
1742 SourceLocation EndLoc = Tok.getLastLoc();
1743 Tok.setKind(tok::annot_typename);
1744 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1745 Tok.setAnnotationEndLoc(EndLoc);
1746 Tok.setLocation(TypenameLoc);
1747 PP.AnnotateCachedTokens(Tok);
1751 // Remembers whether the token was originally a scope annotation.
1752 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1755 if (getLangOpts().CPlusPlus)
1756 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
1759 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1762 /// Try to annotate a type or scope token, having already parsed an
1763 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1764 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1765 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
1767 if (Tok.is(tok::identifier)) {
1768 // Determine whether the identifier is a type name.
1769 if (ParsedType Ty = Actions.getTypeName(
1770 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1771 false, NextToken().is(tok::period), nullptr,
1772 /*IsCtorOrDtorName=*/false,
1773 /*NonTrivialTypeSourceInfo*/true,
1774 /*IsClassTemplateDeductionContext*/true)) {
1775 SourceLocation BeginLoc = Tok.getLocation();
1776 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1777 BeginLoc = SS.getBeginLoc();
1779 /// An Objective-C object type followed by '<' is a specialization of
1780 /// a parameterized class type or a protocol-qualified type.
1781 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1782 (Ty.get()->isObjCObjectType() ||
1783 Ty.get()->isObjCObjectPointerType())) {
1784 // Consume the name.
1785 SourceLocation IdentifierLoc = ConsumeToken();
1786 SourceLocation NewEndLoc;
1788 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1789 /*consumeLastToken=*/false,
1791 if (NewType.isUsable())
1793 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1797 // This is a typename. Replace the current token in-place with an
1798 // annotation type token.
1799 Tok.setKind(tok::annot_typename);
1800 setTypeAnnotation(Tok, Ty);
1801 Tok.setAnnotationEndLoc(Tok.getLocation());
1802 Tok.setLocation(BeginLoc);
1804 // In case the tokens were cached, have Preprocessor replace
1805 // them with the annotation token.
1806 PP.AnnotateCachedTokens(Tok);
1810 if (!getLangOpts().CPlusPlus) {
1811 // If we're in C, we can't have :: tokens at all (the lexer won't return
1812 // them). If the identifier is not a type, then it can't be scope either,
1817 // If this is a template-id, annotate with a template-id or type token.
1818 if (NextToken().is(tok::less)) {
1819 TemplateTy Template;
1820 UnqualifiedId TemplateName;
1821 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1822 bool MemberOfUnknownSpecialization;
1823 if (TemplateNameKind TNK = Actions.isTemplateName(
1825 /*hasTemplateKeyword=*/false, TemplateName,
1826 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1827 MemberOfUnknownSpecialization)) {
1828 // Consume the identifier.
1830 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1832 // If an unrecoverable error occurred, we need to return true here,
1833 // because the token stream is in a damaged state. We may not return
1834 // a valid identifier.
1840 // The current token, which is either an identifier or a
1841 // template-id, is not part of the annotation. Fall through to
1842 // push that token back into the stream and complete the C++ scope
1843 // specifier annotation.
1846 if (Tok.is(tok::annot_template_id)) {
1847 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1848 if (TemplateId->Kind == TNK_Type_template) {
1849 // A template-id that refers to a type was parsed into a
1850 // template-id annotation in a context where we weren't allowed
1851 // to produce a type annotation token. Update the template-id
1852 // annotation token to a type annotation token now.
1853 AnnotateTemplateIdTokenAsType();
1861 // A C++ scope specifier that isn't followed by a typename.
1862 AnnotateScopeToken(SS, IsNewScope);
1866 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1867 /// annotates C++ scope specifiers and template-ids. This returns
1868 /// true if there was an error that could not be recovered from.
1870 /// Note that this routine emits an error if you call it with ::new or ::delete
1871 /// as the current tokens, so only call it in contexts where these are invalid.
1872 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1873 assert(getLangOpts().CPlusPlus &&
1874 "Call sites of this function should be guarded by checking for C++");
1875 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1876 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1877 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1878 "Cannot be a type or scope token!");
1881 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1886 AnnotateScopeToken(SS, true);
1890 bool Parser::isTokenEqualOrEqualTypo() {
1891 tok::TokenKind Kind = Tok.getKind();
1895 case tok::ampequal: // &=
1896 case tok::starequal: // *=
1897 case tok::plusequal: // +=
1898 case tok::minusequal: // -=
1899 case tok::exclaimequal: // !=
1900 case tok::slashequal: // /=
1901 case tok::percentequal: // %=
1902 case tok::lessequal: // <=
1903 case tok::lesslessequal: // <<=
1904 case tok::greaterequal: // >=
1905 case tok::greatergreaterequal: // >>=
1906 case tok::caretequal: // ^=
1907 case tok::pipeequal: // |=
1908 case tok::equalequal: // ==
1909 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1911 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1918 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1919 assert(Tok.is(tok::code_completion));
1920 PrevTokLocation = Tok.getLocation();
1922 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1923 if (S->getFlags() & Scope::FnScope) {
1924 Actions.CodeCompleteOrdinaryName(getCurScope(),
1925 Sema::PCC_RecoveryInFunction);
1927 return PrevTokLocation;
1930 if (S->getFlags() & Scope::ClassScope) {
1931 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1933 return PrevTokLocation;
1937 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1939 return PrevTokLocation;
1942 // Code-completion pass-through functions
1944 void Parser::CodeCompleteDirective(bool InConditional) {
1945 Actions.CodeCompletePreprocessorDirective(InConditional);
1948 void Parser::CodeCompleteInConditionalExclusion() {
1949 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1952 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1953 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1956 void Parser::CodeCompletePreprocessorExpression() {
1957 Actions.CodeCompletePreprocessorExpression();
1960 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1961 MacroInfo *MacroInfo,
1962 unsigned ArgumentIndex) {
1963 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1967 void Parser::CodeCompleteNaturalLanguage() {
1968 Actions.CodeCompleteNaturalLanguage();
1971 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1972 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1973 "Expected '__if_exists' or '__if_not_exists'");
1974 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1975 Result.KeywordLoc = ConsumeToken();
1977 BalancedDelimiterTracker T(*this, tok::l_paren);
1978 if (T.consumeOpen()) {
1979 Diag(Tok, diag::err_expected_lparen_after)
1980 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1984 // Parse nested-name-specifier.
1985 if (getLangOpts().CPlusPlus)
1986 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1987 /*EnteringContext=*/false);
1989 // Check nested-name specifier.
1990 if (Result.SS.isInvalid()) {
1995 // Parse the unqualified-id.
1996 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1997 if (ParseUnqualifiedId(
1998 Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
1999 /*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
2000 &TemplateKWLoc, Result.Name)) {
2005 if (T.consumeClose())
2008 // Check if the symbol exists.
2009 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
2010 Result.IsIfExists, Result.SS,
2012 case Sema::IER_Exists:
2013 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
2016 case Sema::IER_DoesNotExist:
2017 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
2020 case Sema::IER_Dependent:
2021 Result.Behavior = IEB_Dependent;
2024 case Sema::IER_Error:
2031 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2032 IfExistsCondition Result;
2033 if (ParseMicrosoftIfExistsCondition(Result))
2036 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2037 if (Braces.consumeOpen()) {
2038 Diag(Tok, diag::err_expected) << tok::l_brace;
2042 switch (Result.Behavior) {
2044 // Parse declarations below.
2048 llvm_unreachable("Cannot have a dependent external declaration");
2055 // Parse the declarations.
2056 // FIXME: Support module import within __if_exists?
2057 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2058 ParsedAttributesWithRange attrs(AttrFactory);
2059 MaybeParseCXX11Attributes(attrs);
2060 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2061 if (Result && !getCurScope()->getParent())
2062 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2064 Braces.consumeClose();
2067 /// Parse a C++ Modules TS module declaration, which appears at the beginning
2068 /// of a module interface, module partition, or module implementation file.
2070 /// module-declaration: [Modules TS + P0273R0 + P0629R0]
2071 /// 'export'[opt] 'module' 'partition'[opt]
2072 /// module-name attribute-specifier-seq[opt] ';'
2074 /// Note that 'partition' is a context-sensitive keyword.
2075 Parser::DeclGroupPtrTy Parser::ParseModuleDecl() {
2076 SourceLocation StartLoc = Tok.getLocation();
2078 Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
2079 ? Sema::ModuleDeclKind::Interface
2080 : Sema::ModuleDeclKind::Implementation;
2082 assert(Tok.is(tok::kw_module) && "not a module declaration");
2083 SourceLocation ModuleLoc = ConsumeToken();
2085 if (Tok.is(tok::identifier) && NextToken().is(tok::identifier) &&
2086 Tok.getIdentifierInfo()->isStr("partition")) {
2087 // If 'partition' is present, this must be a module interface unit.
2088 if (MDK != Sema::ModuleDeclKind::Interface)
2089 Diag(Tok.getLocation(), diag::err_module_implementation_partition)
2090 << FixItHint::CreateInsertion(ModuleLoc, "export ");
2091 MDK = Sema::ModuleDeclKind::Partition;
2095 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2096 if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2099 // We don't support any module attributes yet; just parse them and diagnose.
2100 ParsedAttributesWithRange Attrs(AttrFactory);
2101 MaybeParseCXX11Attributes(Attrs);
2102 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2104 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2106 return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path);
2109 /// Parse a module import declaration. This is essentially the same for
2110 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2111 /// and the trailing optional attributes (in C++).
2113 /// [ObjC] @import declaration:
2114 /// '@' 'import' module-name ';'
2115 /// [ModTS] module-import-declaration:
2116 /// 'import' module-name attribute-specifier-seq[opt] ';'
2117 Decl *Parser::ParseModuleImport(SourceLocation AtLoc) {
2118 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2119 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2120 "Improper start to module import");
2121 bool IsObjCAtImport = Tok.isObjCAtKeyword(tok::objc_import);
2122 SourceLocation ImportLoc = ConsumeToken();
2123 SourceLocation StartLoc = AtLoc.isInvalid() ? ImportLoc : AtLoc;
2125 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2126 if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2129 ParsedAttributesWithRange Attrs(AttrFactory);
2130 MaybeParseCXX11Attributes(Attrs);
2131 // We don't support any module import attributes yet.
2132 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2134 if (PP.hadModuleLoaderFatalFailure()) {
2135 // With a fatal failure in the module loader, we abort parsing.
2140 DeclResult Import = Actions.ActOnModuleImport(StartLoc, ImportLoc, Path);
2141 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2142 if (Import.isInvalid())
2145 // Using '@import' in framework headers requires modules to be enabled so that
2146 // the header is parseable. Emit a warning to make the user aware.
2147 if (IsObjCAtImport && AtLoc.isValid()) {
2148 auto &SrcMgr = PP.getSourceManager();
2149 auto *FE = SrcMgr.getFileEntryForID(SrcMgr.getFileID(AtLoc));
2150 if (FE && llvm::sys::path::parent_path(FE->getDir()->getName())
2151 .endswith(".framework"))
2152 Diags.Report(AtLoc, diag::warn_atimport_in_framework_header);
2155 return Import.get();
2158 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2162 /// module-name-qualifier[opt] identifier
2163 /// module-name-qualifier:
2164 /// module-name-qualifier[opt] identifier '.'
2165 bool Parser::ParseModuleName(
2166 SourceLocation UseLoc,
2167 SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2169 // Parse the module path.
2171 if (!Tok.is(tok::identifier)) {
2172 if (Tok.is(tok::code_completion)) {
2173 Actions.CodeCompleteModuleImport(UseLoc, Path);
2178 Diag(Tok, diag::err_module_expected_ident) << IsImport;
2179 SkipUntil(tok::semi);
2183 // Record this part of the module path.
2184 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2187 if (Tok.isNot(tok::period))
2194 /// Try recover parser when module annotation appears where it must not
2196 /// \returns false if the recover was successful and parsing may be continued, or
2197 /// true if parser must bail out to top level and handle the token there.
2198 bool Parser::parseMisplacedModuleImport() {
2200 switch (Tok.getKind()) {
2201 case tok::annot_module_end:
2202 // If we recovered from a misplaced module begin, we expect to hit a
2203 // misplaced module end too. Stay in the current context when this
2205 if (MisplacedModuleBeginCount) {
2206 --MisplacedModuleBeginCount;
2207 Actions.ActOnModuleEnd(Tok.getLocation(),
2208 reinterpret_cast<Module *>(
2209 Tok.getAnnotationValue()));
2210 ConsumeAnnotationToken();
2213 // Inform caller that recovery failed, the error must be handled at upper
2214 // level. This will generate the desired "missing '}' at end of module"
2215 // diagnostics on the way out.
2217 case tok::annot_module_begin:
2218 // Recover by entering the module (Sema will diagnose).
2219 Actions.ActOnModuleBegin(Tok.getLocation(),
2220 reinterpret_cast<Module *>(
2221 Tok.getAnnotationValue()));
2222 ConsumeAnnotationToken();
2223 ++MisplacedModuleBeginCount;
2225 case tok::annot_module_include:
2226 // Module import found where it should not be, for instance, inside a
2227 // namespace. Recover by importing the module.
2228 Actions.ActOnModuleInclude(Tok.getLocation(),
2229 reinterpret_cast<Module *>(
2230 Tok.getAnnotationValue()));
2231 ConsumeAnnotationToken();
2232 // If there is another module import, process it.
2241 bool BalancedDelimiterTracker::diagnoseOverflow() {
2242 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2243 << P.getLangOpts().BracketDepth;
2244 P.Diag(P.Tok, diag::note_bracket_depth);
2249 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2251 tok::TokenKind SkipToTok) {
2252 LOpen = P.Tok.getLocation();
2253 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2254 if (SkipToTok != tok::unknown)
2255 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2259 if (getDepth() < P.getLangOpts().BracketDepth)
2262 return diagnoseOverflow();
2265 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2266 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2268 if (P.Tok.is(tok::annot_module_end))
2269 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2271 P.Diag(P.Tok, diag::err_expected) << Close;
2272 P.Diag(LOpen, diag::note_matching) << Kind;
2274 // If we're not already at some kind of closing bracket, skip to our closing
2276 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2277 P.Tok.isNot(tok::r_square) &&
2278 P.SkipUntil(Close, FinalToken,
2279 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2281 LClose = P.ConsumeAnyToken();
2285 void BalancedDelimiterTracker::skipToEnd() {
2286 P.SkipUntil(Close, Parser::StopBeforeMatch);