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.
340 case tok::string_literal:
341 case tok::wide_string_literal:
342 case tok::utf8_string_literal:
343 case tok::utf16_string_literal:
344 case tok::utf32_string_literal:
345 ConsumeStringToken();
349 if (HasFlagsSet(Flags, StopAtSemi))
357 isFirstTokenSkipped = false;
361 //===----------------------------------------------------------------------===//
362 // Scope manipulation
363 //===----------------------------------------------------------------------===//
365 /// EnterScope - Start a new scope.
366 void Parser::EnterScope(unsigned ScopeFlags) {
367 if (NumCachedScopes) {
368 Scope *N = ScopeCache[--NumCachedScopes];
369 N->Init(getCurScope(), ScopeFlags);
370 Actions.CurScope = N;
372 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
376 /// ExitScope - Pop a scope off the scope stack.
377 void Parser::ExitScope() {
378 assert(getCurScope() && "Scope imbalance!");
380 // Inform the actions module that this scope is going away if there are any
382 Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
384 Scope *OldScope = getCurScope();
385 Actions.CurScope = OldScope->getParent();
387 if (NumCachedScopes == ScopeCacheSize)
390 ScopeCache[NumCachedScopes++] = OldScope;
393 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
394 /// this object does nothing.
395 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
397 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
399 OldFlags = CurScope->getFlags();
400 CurScope->setFlags(ScopeFlags);
404 /// Restore the flags for the current scope to what they were before this
405 /// object overrode them.
406 Parser::ParseScopeFlags::~ParseScopeFlags() {
408 CurScope->setFlags(OldFlags);
412 //===----------------------------------------------------------------------===//
413 // C99 6.9: External Definitions.
414 //===----------------------------------------------------------------------===//
417 // If we still have scopes active, delete the scope tree.
418 delete getCurScope();
419 Actions.CurScope = nullptr;
421 // Free the scope cache.
422 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
423 delete ScopeCache[i];
425 resetPragmaHandlers();
427 PP.removeCommentHandler(CommentSemaHandler.get());
429 PP.clearCodeCompletionHandler();
431 if (getLangOpts().DelayedTemplateParsing &&
432 !PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
433 // If an ASTConsumer parsed delay-parsed templates in their
434 // HandleTranslationUnit() method, TemplateIds created there were not
435 // guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
436 // ParseTopLevelDecl(). Destroy them here.
437 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
440 assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
443 /// Initialize - Warm up the parser.
445 void Parser::Initialize() {
446 // Create the translation unit scope. Install it as the current scope.
447 assert(getCurScope() == nullptr && "A scope is already active?");
448 EnterScope(Scope::DeclScope);
449 Actions.ActOnTranslationUnitScope(getCurScope());
451 // Initialization for Objective-C context sensitive keywords recognition.
452 // Referenced in Parser::ParseObjCTypeQualifierList.
453 if (getLangOpts().ObjC1) {
454 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
455 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
456 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
457 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
458 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
459 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
460 ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
461 ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
462 ObjCTypeQuals[objc_null_unspecified]
463 = &PP.getIdentifierTable().get("null_unspecified");
466 Ident_instancetype = nullptr;
467 Ident_final = nullptr;
468 Ident_sealed = nullptr;
469 Ident_override = nullptr;
470 Ident_GNU_final = nullptr;
472 Ident_super = &PP.getIdentifierTable().get("super");
474 Ident_vector = nullptr;
475 Ident_bool = nullptr;
476 Ident_pixel = nullptr;
477 if (getLangOpts().AltiVec || getLangOpts().ZVector) {
478 Ident_vector = &PP.getIdentifierTable().get("vector");
479 Ident_bool = &PP.getIdentifierTable().get("bool");
481 if (getLangOpts().AltiVec)
482 Ident_pixel = &PP.getIdentifierTable().get("pixel");
484 Ident_introduced = nullptr;
485 Ident_deprecated = nullptr;
486 Ident_obsoleted = nullptr;
487 Ident_unavailable = nullptr;
488 Ident_strict = nullptr;
489 Ident_replacement = nullptr;
491 Ident_language = Ident_defined_in = Ident_generated_declaration = nullptr;
493 Ident__except = nullptr;
495 Ident__exception_code = Ident__exception_info = nullptr;
496 Ident__abnormal_termination = Ident___exception_code = nullptr;
497 Ident___exception_info = Ident___abnormal_termination = nullptr;
498 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
499 Ident_AbnormalTermination = nullptr;
501 if(getLangOpts().Borland) {
502 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
503 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
504 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
505 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
506 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
507 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
508 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
509 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
510 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
512 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
513 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
514 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
515 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
516 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
517 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
518 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
519 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
520 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
523 Actions.Initialize();
525 // Prime the lexer look-ahead.
529 void Parser::LateTemplateParserCleanupCallback(void *P) {
530 // While this RAII helper doesn't bracket any actual work, the destructor will
531 // clean up annotations that were created during ActOnEndOfTranslationUnit
532 // when incremental processing is enabled.
533 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
536 bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result) {
537 // C++ Modules TS: module-declaration must be the first declaration in the
538 // file. (There can be no preceding preprocessor directives, but we expect
539 // the lexer to check that.)
540 if (Tok.is(tok::kw_module)) {
541 Result = ParseModuleDecl();
543 } else if (getLangOpts().getCompilingModule() ==
544 LangOptions::CMK_ModuleInterface) {
545 // FIXME: We avoid providing this diagnostic when generating an object file
546 // from an existing PCM file. This is not a good way to detect this
547 // condition; we should provide a mechanism to indicate whether we've
548 // already parsed a declaration in this translation unit and avoid calling
549 // ParseFirstTopLevelDecl in that case.
550 if (Actions.TUKind == TU_Module)
551 Diag(Tok, diag::err_expected_module_interface_decl);
554 // C11 6.9p1 says translation units must have at least one top-level
555 // declaration. C++ doesn't have this restriction. We also don't want to
556 // complain if we have a precompiled header, although technically if the PCH
557 // is empty we should still emit the (pedantic) diagnostic.
558 bool NoTopLevelDecls = ParseTopLevelDecl(Result);
559 if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
560 !getLangOpts().CPlusPlus)
561 Diag(diag::ext_empty_translation_unit);
563 return NoTopLevelDecls;
566 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
567 /// action tells us to. This returns true if the EOF was encountered.
568 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
569 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
571 // Skip over the EOF token, flagging end of previous input for incremental
573 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
577 switch (Tok.getKind()) {
578 case tok::annot_pragma_unused:
579 HandlePragmaUnused();
583 Result = ParseModuleImport(SourceLocation());
586 case tok::annot_module_include:
587 Actions.ActOnModuleInclude(Tok.getLocation(),
588 reinterpret_cast<Module *>(
589 Tok.getAnnotationValue()));
593 case tok::annot_module_begin:
594 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
595 Tok.getAnnotationValue()));
599 case tok::annot_module_end:
600 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
601 Tok.getAnnotationValue()));
605 case tok::annot_pragma_attribute:
606 HandlePragmaAttribute();
610 // Late template parsing can begin.
611 if (getLangOpts().DelayedTemplateParsing)
612 Actions.SetLateTemplateParser(LateTemplateParserCallback,
613 PP.isIncrementalProcessingEnabled() ?
614 LateTemplateParserCleanupCallback : nullptr,
616 if (!PP.isIncrementalProcessingEnabled())
617 Actions.ActOnEndOfTranslationUnit();
618 //else don't tell Sema that we ended parsing: more input might come.
625 ParsedAttributesWithRange attrs(AttrFactory);
626 MaybeParseCXX11Attributes(attrs);
628 Result = ParseExternalDeclaration(attrs);
632 /// ParseExternalDeclaration:
634 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
635 /// function-definition
637 /// [GNU] asm-definition
638 /// [GNU] __extension__ external-declaration
639 /// [OBJC] objc-class-definition
640 /// [OBJC] objc-class-declaration
641 /// [OBJC] objc-alias-declaration
642 /// [OBJC] objc-protocol-definition
643 /// [OBJC] objc-method-definition
645 /// [C++] linkage-specification
646 /// [GNU] asm-definition:
647 /// simple-asm-expr ';'
648 /// [C++11] empty-declaration
649 /// [C++11] attribute-declaration
651 /// [C++11] empty-declaration:
654 /// [C++0x/GNU] 'extern' 'template' declaration
655 Parser::DeclGroupPtrTy
656 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
657 ParsingDeclSpec *DS) {
658 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
659 ParenBraceBracketBalancer BalancerRAIIObj(*this);
661 if (PP.isCodeCompletionReached()) {
666 Decl *SingleDecl = nullptr;
667 switch (Tok.getKind()) {
668 case tok::annot_pragma_vis:
669 HandlePragmaVisibility();
671 case tok::annot_pragma_pack:
674 case tok::annot_pragma_msstruct:
675 HandlePragmaMSStruct();
677 case tok::annot_pragma_align:
680 case tok::annot_pragma_weak:
683 case tok::annot_pragma_weakalias:
684 HandlePragmaWeakAlias();
686 case tok::annot_pragma_redefine_extname:
687 HandlePragmaRedefineExtname();
689 case tok::annot_pragma_fp_contract:
690 HandlePragmaFPContract();
692 case tok::annot_pragma_fp:
695 case tok::annot_pragma_opencl_extension:
696 HandlePragmaOpenCLExtension();
698 case tok::annot_pragma_openmp: {
699 AccessSpecifier AS = AS_none;
700 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
702 case tok::annot_pragma_ms_pointers_to_members:
703 HandlePragmaMSPointersToMembers();
705 case tok::annot_pragma_ms_vtordisp:
706 HandlePragmaMSVtorDisp();
708 case tok::annot_pragma_ms_pragma:
709 HandlePragmaMSPragma();
711 case tok::annot_pragma_dump:
715 // Either a C++11 empty-declaration or attribute-declaration.
716 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
719 ConsumeExtraSemi(OutsideFunction);
722 Diag(Tok, diag::err_extraneous_closing_brace);
726 Diag(Tok, diag::err_expected_external_declaration);
728 case tok::kw___extension__: {
729 // __extension__ silences extension warnings in the subexpression.
730 ExtensionRAIIObject O(Diags); // Use RAII to do this.
732 return ParseExternalDeclaration(attrs);
735 ProhibitAttributes(attrs);
737 SourceLocation StartLoc = Tok.getLocation();
738 SourceLocation EndLoc;
740 ExprResult Result(ParseSimpleAsm(&EndLoc));
742 // Check if GNU-style InlineAsm is disabled.
743 // Empty asm string is allowed because it will not introduce
744 // any assembly code.
745 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
746 const auto *SL = cast<StringLiteral>(Result.get());
747 if (!SL->getString().trim().empty())
748 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
751 ExpectAndConsume(tok::semi, diag::err_expected_after,
752 "top-level asm block");
754 if (Result.isInvalid())
756 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
760 return ParseObjCAtDirectives();
763 if (!getLangOpts().ObjC1) {
764 Diag(Tok, diag::err_expected_external_declaration);
768 SingleDecl = ParseObjCMethodDefinition();
770 case tok::code_completion:
771 Actions.CodeCompleteOrdinaryName(getCurScope(),
772 CurParsedObjCImpl? Sema::PCC_ObjCImplementation
773 : Sema::PCC_Namespace);
777 if (getLangOpts().ModulesTS) {
778 SingleDecl = ParseExportDeclaration();
781 // This must be 'export template'. Parse it so we can diagnose our lack
784 case tok::kw_namespace:
785 case tok::kw_typedef:
786 case tok::kw_template:
787 case tok::kw_static_assert:
788 case tok::kw__Static_assert:
789 // A function definition cannot start with any of these keywords.
791 SourceLocation DeclEnd;
792 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
796 // Parse (then ignore) 'static' prior to a template instantiation. This is
797 // a GCC extension that we intentionally do not support.
798 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
799 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
801 SourceLocation DeclEnd;
802 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
807 if (getLangOpts().CPlusPlus) {
808 tok::TokenKind NextKind = NextToken().getKind();
810 // Inline namespaces. Allowed as an extension even in C++03.
811 if (NextKind == tok::kw_namespace) {
812 SourceLocation DeclEnd;
813 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
816 // Parse (then ignore) 'inline' prior to a template instantiation. This is
817 // a GCC extension that we intentionally do not support.
818 if (NextKind == tok::kw_template) {
819 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
821 SourceLocation DeclEnd;
822 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
828 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
830 SourceLocation ExternLoc = ConsumeToken();
831 SourceLocation TemplateLoc = ConsumeToken();
832 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
833 diag::warn_cxx98_compat_extern_template :
834 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
835 SourceLocation DeclEnd;
836 return Actions.ConvertDeclToDeclGroup(
837 ParseExplicitInstantiation(Declarator::FileContext,
838 ExternLoc, TemplateLoc, DeclEnd));
842 case tok::kw___if_exists:
843 case tok::kw___if_not_exists:
844 ParseMicrosoftIfExistsExternalDeclaration();
848 Diag(Tok, diag::err_unexpected_module_decl);
849 SkipUntil(tok::semi);
854 if (Tok.isEditorPlaceholder()) {
858 // We can't tell whether this is a function-definition or declaration yet.
859 return ParseDeclarationOrFunctionDefinition(attrs, DS);
862 // This routine returns a DeclGroup, if the thing we parsed only contains a
863 // single decl, convert it now.
864 return Actions.ConvertDeclToDeclGroup(SingleDecl);
867 /// \brief Determine whether the current token, if it occurs after a
868 /// declarator, continues a declaration or declaration list.
869 bool Parser::isDeclarationAfterDeclarator() {
870 // Check for '= delete' or '= default'
871 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
872 const Token &KW = NextToken();
873 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
877 return Tok.is(tok::equal) || // int X()= -> not a function def
878 Tok.is(tok::comma) || // int X(), -> not a function def
879 Tok.is(tok::semi) || // int X(); -> not a function def
880 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
881 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
882 (getLangOpts().CPlusPlus &&
883 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
886 /// \brief Determine whether the current token, if it occurs after a
887 /// declarator, indicates the start of a function definition.
888 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
889 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
890 if (Tok.is(tok::l_brace)) // int X() {}
893 // Handle K&R C argument lists: int X(f) int f; {}
894 if (!getLangOpts().CPlusPlus &&
895 Declarator.getFunctionTypeInfo().isKNRPrototype())
896 return isDeclarationSpecifier();
898 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
899 const Token &KW = NextToken();
900 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
903 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
904 Tok.is(tok::kw_try); // X() try { ... }
907 /// Parse either a function-definition or a declaration. We can't tell which
908 /// we have until we read up to the compound-statement in function-definition.
909 /// TemplateParams, if non-NULL, provides the template parameters when we're
910 /// parsing a C++ template-declaration.
912 /// function-definition: [C99 6.9.1]
913 /// decl-specs declarator declaration-list[opt] compound-statement
914 /// [C90] function-definition: [C99 6.7.1] - implicit int result
915 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
917 /// declaration: [C99 6.7]
918 /// declaration-specifiers init-declarator-list[opt] ';'
919 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
920 /// [OMP] threadprivate-directive [TODO]
922 Parser::DeclGroupPtrTy
923 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
925 AccessSpecifier AS) {
926 MaybeParseMicrosoftAttributes(DS.getAttributes());
927 // Parse the common declaration-specifiers piece.
928 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
930 // If we had a free-standing type definition with a missing semicolon, we
931 // may get this far before the problem becomes obvious.
932 if (DS.hasTagDefinition() &&
933 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
936 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
937 // declaration-specifiers init-declarator-list[opt] ';'
938 if (Tok.is(tok::semi)) {
939 ProhibitAttributes(attrs);
941 RecordDecl *AnonRecord = nullptr;
942 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
944 DS.complete(TheDecl);
945 if (getLangOpts().OpenCL)
946 Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
948 Decl* decls[] = {AnonRecord, TheDecl};
949 return Actions.BuildDeclaratorGroup(decls);
951 return Actions.ConvertDeclToDeclGroup(TheDecl);
954 DS.takeAttributesFrom(attrs);
956 // ObjC2 allows prefix attributes on class interfaces and protocols.
957 // FIXME: This still needs better diagnostics. We should only accept
958 // attributes here, no types, etc.
959 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
960 SourceLocation AtLoc = ConsumeToken(); // the "@"
961 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
962 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
963 Diag(Tok, diag::err_objc_unexpected_attr);
964 SkipUntil(tok::semi); // FIXME: better skip?
970 const char *PrevSpec = nullptr;
972 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
973 Actions.getASTContext().getPrintingPolicy()))
974 Diag(AtLoc, DiagID) << PrevSpec;
976 if (Tok.isObjCAtKeyword(tok::objc_protocol))
977 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
979 return Actions.ConvertDeclToDeclGroup(
980 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
983 // If the declspec consisted only of 'extern' and we have a string
984 // literal following it, this must be a C++ linkage specifier like
986 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
987 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
988 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
989 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
990 return Actions.ConvertDeclToDeclGroup(TheDecl);
993 return ParseDeclGroup(DS, Declarator::FileContext);
996 Parser::DeclGroupPtrTy
997 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
999 AccessSpecifier AS) {
1001 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
1003 ParsingDeclSpec PDS(*this);
1004 // Must temporarily exit the objective-c container scope for
1005 // parsing c constructs and re-enter objc container scope
1007 ObjCDeclContextSwitch ObjCDC(*this);
1009 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
1013 /// ParseFunctionDefinition - We parsed and verified that the specified
1014 /// Declarator is well formed. If this is a K&R-style function, read the
1015 /// parameters declaration-list, then start the compound-statement.
1017 /// function-definition: [C99 6.9.1]
1018 /// decl-specs declarator declaration-list[opt] compound-statement
1019 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1020 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1021 /// [C++] function-definition: [C++ 8.4]
1022 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1024 /// [C++] function-definition: [C++ 8.4]
1025 /// decl-specifier-seq[opt] declarator function-try-block
1027 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1028 const ParsedTemplateInfo &TemplateInfo,
1029 LateParsedAttrList *LateParsedAttrs) {
1030 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1031 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1032 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1034 // If this is C90 and the declspecs were completely missing, fudge in an
1035 // implicit int. We do this here because this is the only place where
1036 // declaration-specifiers are completely optional in the grammar.
1037 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1038 const char *PrevSpec;
1040 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1041 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
1042 D.getIdentifierLoc(),
1045 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1048 // If this declaration was formed with a K&R-style identifier list for the
1049 // arguments, parse declarations for all of the args next.
1050 // int foo(a,b) int a; float b; {}
1051 if (FTI.isKNRPrototype())
1052 ParseKNRParamDeclarations(D);
1054 // We should have either an opening brace or, in a C++ constructor,
1055 // we may have a colon.
1056 if (Tok.isNot(tok::l_brace) &&
1057 (!getLangOpts().CPlusPlus ||
1058 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1059 Tok.isNot(tok::equal)))) {
1060 Diag(Tok, diag::err_expected_fn_body);
1062 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1063 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1065 // If we didn't find the '{', bail out.
1066 if (Tok.isNot(tok::l_brace))
1070 // Check to make sure that any normal attributes are allowed to be on
1071 // a definition. Late parsed attributes are checked at the end.
1072 if (Tok.isNot(tok::equal)) {
1073 AttributeList *DtorAttrs = D.getAttributes();
1075 if (DtorAttrs->isKnownToGCC() &&
1076 !DtorAttrs->isCXX11Attribute()) {
1077 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1078 << DtorAttrs->getName();
1080 DtorAttrs = DtorAttrs->getNext();
1084 // In delayed template parsing mode, for function template we consume the
1085 // tokens and store them for late parsing at the end of the translation unit.
1086 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1087 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1088 Actions.canDelayFunctionBody(D)) {
1089 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1091 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1092 Scope *ParentScope = getCurScope()->getParent();
1094 D.setFunctionDefinitionKind(FDK_Definition);
1095 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1096 TemplateParameterLists);
1098 D.getMutableDeclSpec().abort();
1100 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1101 trySkippingFunctionBody()) {
1103 return Actions.ActOnSkippedFunctionBody(DP);
1107 LexTemplateFunctionForLateParsing(Toks);
1110 FunctionDecl *FnD = DP->getAsFunction();
1111 Actions.CheckForFunctionRedefinition(FnD);
1112 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1116 else if (CurParsedObjCImpl &&
1117 !TemplateInfo.TemplateParams &&
1118 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1119 Tok.is(tok::colon)) &&
1120 Actions.CurContext->isTranslationUnit()) {
1121 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1122 Scope *ParentScope = getCurScope()->getParent();
1124 D.setFunctionDefinitionKind(FDK_Definition);
1125 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1126 MultiTemplateParamsArg());
1127 D.complete(FuncDecl);
1128 D.getMutableDeclSpec().abort();
1130 // Consume the tokens and store them for later parsing.
1131 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1132 CurParsedObjCImpl->HasCFunction = true;
1135 // FIXME: Should we really fall through here?
1138 // Enter a scope for the function body.
1139 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1141 // Tell the actions module that we have entered a function definition with the
1142 // specified Declarator for the function.
1143 Sema::SkipBodyInfo SkipBody;
1144 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1145 TemplateInfo.TemplateParams
1146 ? *TemplateInfo.TemplateParams
1147 : MultiTemplateParamsArg(),
1150 if (SkipBody.ShouldSkip) {
1155 // Break out of the ParsingDeclarator context before we parse the body.
1158 // Break out of the ParsingDeclSpec context, too. This const_cast is
1159 // safe because we're always the sole owner.
1160 D.getMutableDeclSpec().abort();
1162 if (TryConsumeToken(tok::equal)) {
1163 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1165 bool Delete = false;
1166 SourceLocation KWLoc;
1167 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1168 Diag(KWLoc, getLangOpts().CPlusPlus11
1169 ? diag::warn_cxx98_compat_defaulted_deleted_function
1170 : diag::ext_defaulted_deleted_function)
1172 Actions.SetDeclDeleted(Res, KWLoc);
1174 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1175 Diag(KWLoc, getLangOpts().CPlusPlus11
1176 ? diag::warn_cxx98_compat_defaulted_deleted_function
1177 : diag::ext_defaulted_deleted_function)
1178 << 0 /* defaulted */;
1179 Actions.SetDeclDefaulted(Res, KWLoc);
1181 llvm_unreachable("function definition after = not 'delete' or 'default'");
1184 if (Tok.is(tok::comma)) {
1185 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1187 SkipUntil(tok::semi);
1188 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1189 Delete ? "delete" : "default")) {
1190 SkipUntil(tok::semi);
1193 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1194 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1198 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1199 trySkippingFunctionBody()) {
1201 Actions.ActOnSkippedFunctionBody(Res);
1202 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1205 if (Tok.is(tok::kw_try))
1206 return ParseFunctionTryBlock(Res, BodyScope);
1208 // If we have a colon, then we're probably parsing a C++
1209 // ctor-initializer.
1210 if (Tok.is(tok::colon)) {
1211 ParseConstructorInitializer(Res);
1213 // Recover from error.
1214 if (!Tok.is(tok::l_brace)) {
1216 Actions.ActOnFinishFunctionBody(Res, nullptr);
1220 Actions.ActOnDefaultCtorInitializers(Res);
1222 // Late attributes are parsed in the same scope as the function body.
1223 if (LateParsedAttrs)
1224 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1226 return ParseFunctionStatementBody(Res, BodyScope);
1229 void Parser::SkipFunctionBody() {
1230 if (Tok.is(tok::equal)) {
1231 SkipUntil(tok::semi);
1235 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1236 if (IsFunctionTryBlock)
1239 CachedTokens Skipped;
1240 if (ConsumeAndStoreFunctionPrologue(Skipped))
1241 SkipMalformedDecl();
1243 SkipUntil(tok::r_brace);
1244 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1245 SkipUntil(tok::l_brace);
1246 SkipUntil(tok::r_brace);
1251 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1252 /// types for a function with a K&R-style identifier list for arguments.
1253 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1254 // We know that the top-level of this declarator is a function.
1255 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1257 // Enter function-declaration scope, limiting any declarators to the
1258 // function prototype scope, including parameter declarators.
1259 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1260 Scope::FunctionDeclarationScope | Scope::DeclScope);
1262 // Read all the argument declarations.
1263 while (isDeclarationSpecifier()) {
1264 SourceLocation DSStart = Tok.getLocation();
1266 // Parse the common declaration-specifiers piece.
1267 DeclSpec DS(AttrFactory);
1268 ParseDeclarationSpecifiers(DS);
1270 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1271 // least one declarator'.
1272 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1273 // the declarations though. It's trivial to ignore them, really hard to do
1274 // anything else with them.
1275 if (TryConsumeToken(tok::semi)) {
1276 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1280 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1282 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1283 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1284 Diag(DS.getStorageClassSpecLoc(),
1285 diag::err_invalid_storage_class_in_func_decl);
1286 DS.ClearStorageClassSpecs();
1288 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1289 Diag(DS.getThreadStorageClassSpecLoc(),
1290 diag::err_invalid_storage_class_in_func_decl);
1291 DS.ClearStorageClassSpecs();
1294 // Parse the first declarator attached to this declspec.
1295 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1296 ParseDeclarator(ParmDeclarator);
1298 // Handle the full declarator list.
1300 // If attributes are present, parse them.
1301 MaybeParseGNUAttributes(ParmDeclarator);
1303 // Ask the actions module to compute the type for this declarator.
1305 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1308 // A missing identifier has already been diagnosed.
1309 ParmDeclarator.getIdentifier()) {
1311 // Scan the argument list looking for the correct param to apply this
1313 for (unsigned i = 0; ; ++i) {
1314 // C99 6.9.1p6: those declarators shall declare only identifiers from
1315 // the identifier list.
1316 if (i == FTI.NumParams) {
1317 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1318 << ParmDeclarator.getIdentifier();
1322 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1323 // Reject redefinitions of parameters.
1324 if (FTI.Params[i].Param) {
1325 Diag(ParmDeclarator.getIdentifierLoc(),
1326 diag::err_param_redefinition)
1327 << ParmDeclarator.getIdentifier();
1329 FTI.Params[i].Param = Param;
1336 // If we don't have a comma, it is either the end of the list (a ';') or
1337 // an error, bail out.
1338 if (Tok.isNot(tok::comma))
1341 ParmDeclarator.clear();
1343 // Consume the comma.
1344 ParmDeclarator.setCommaLoc(ConsumeToken());
1346 // Parse the next declarator.
1347 ParseDeclarator(ParmDeclarator);
1350 // Consume ';' and continue parsing.
1351 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1354 // Otherwise recover by skipping to next semi or mandatory function body.
1355 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1357 TryConsumeToken(tok::semi);
1360 // The actions module must verify that all arguments were declared.
1361 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1365 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1366 /// allowed to be a wide string, and is not subject to character translation.
1368 /// [GNU] asm-string-literal:
1371 ExprResult Parser::ParseAsmStringLiteral() {
1372 if (!isTokenStringLiteral()) {
1373 Diag(Tok, diag::err_expected_string_literal)
1374 << /*Source='in...'*/0 << "'asm'";
1378 ExprResult AsmString(ParseStringLiteralExpression());
1379 if (!AsmString.isInvalid()) {
1380 const auto *SL = cast<StringLiteral>(AsmString.get());
1381 if (!SL->isAscii()) {
1382 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1384 << SL->getSourceRange();
1393 /// [GNU] simple-asm-expr:
1394 /// 'asm' '(' asm-string-literal ')'
1396 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1397 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1398 SourceLocation Loc = ConsumeToken();
1400 if (Tok.is(tok::kw_volatile)) {
1401 // Remove from the end of 'asm' to the end of 'volatile'.
1402 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1403 PP.getLocForEndOfToken(Tok.getLocation()));
1405 Diag(Tok, diag::warn_file_asm_volatile)
1406 << FixItHint::CreateRemoval(RemovalRange);
1410 BalancedDelimiterTracker T(*this, tok::l_paren);
1411 if (T.consumeOpen()) {
1412 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1416 ExprResult Result(ParseAsmStringLiteral());
1418 if (!Result.isInvalid()) {
1419 // Close the paren and get the location of the end bracket
1422 *EndLoc = T.getCloseLocation();
1423 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1425 *EndLoc = Tok.getLocation();
1432 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1433 /// cleanup pool so that it gets destroyed when parsing the current top level
1434 /// declaration is finished.
1435 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1436 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1437 TemplateIdAnnotation *
1438 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1442 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1443 // Push the current token back into the token stream (or revert it if it is
1444 // cached) and use an annotation scope token for current token.
1445 if (PP.isBacktrackEnabled())
1446 PP.RevertCachedTokens(1);
1449 Tok.setKind(tok::annot_cxxscope);
1450 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1451 Tok.setAnnotationRange(SS.getRange());
1453 // In case the tokens were cached, have Preprocessor replace them
1454 // with the annotation token. We don't need to do this if we've
1455 // just reverted back to a prior state.
1456 if (IsNewAnnotation)
1457 PP.AnnotateCachedTokens(Tok);
1460 /// \brief Attempt to classify the name at the current token position. This may
1461 /// form a type, scope or primary expression annotation, or replace the token
1462 /// with a typo-corrected keyword. This is only appropriate when the current
1463 /// name must refer to an entity which has already been declared.
1465 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1466 /// and might possibly have a dependent nested name specifier.
1467 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1468 /// no typo correction will be performed.
1469 Parser::AnnotatedNameKind
1470 Parser::TryAnnotateName(bool IsAddressOfOperand,
1471 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1472 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1474 const bool EnteringContext = false;
1475 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1478 if (getLangOpts().CPlusPlus &&
1479 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1482 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1483 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1485 return ANK_Unresolved;
1488 IdentifierInfo *Name = Tok.getIdentifierInfo();
1489 SourceLocation NameLoc = Tok.getLocation();
1491 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1492 // typo-correct to tentatively-declared identifiers.
1493 if (isTentativelyDeclared(Name)) {
1494 // Identifier has been tentatively declared, and thus cannot be resolved as
1495 // an expression. Fall back to annotating it as a type.
1496 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1498 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1501 Token Next = NextToken();
1503 // Look up and classify the identifier. We don't perform any typo-correction
1504 // after a scope specifier, because in general we can't recover from typos
1505 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1506 // jump back into scope specifier parsing).
1507 Sema::NameClassification Classification = Actions.ClassifyName(
1508 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1509 SS.isEmpty() ? std::move(CCC) : nullptr);
1511 switch (Classification.getKind()) {
1512 case Sema::NC_Error:
1515 case Sema::NC_Keyword:
1516 // The identifier was typo-corrected to a keyword.
1517 Tok.setIdentifierInfo(Name);
1518 Tok.setKind(Name->getTokenID());
1519 PP.TypoCorrectToken(Tok);
1520 if (SS.isNotEmpty())
1521 AnnotateScopeToken(SS, !WasScopeAnnotation);
1522 // We've "annotated" this as a keyword.
1525 case Sema::NC_Unknown:
1526 // It's not something we know about. Leave it unannotated.
1529 case Sema::NC_Type: {
1530 SourceLocation BeginLoc = NameLoc;
1531 if (SS.isNotEmpty())
1532 BeginLoc = SS.getBeginLoc();
1534 /// An Objective-C object type followed by '<' is a specialization of
1535 /// a parameterized class type or a protocol-qualified type.
1536 ParsedType Ty = Classification.getType();
1537 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1538 (Ty.get()->isObjCObjectType() ||
1539 Ty.get()->isObjCObjectPointerType())) {
1540 // Consume the name.
1541 SourceLocation IdentifierLoc = ConsumeToken();
1542 SourceLocation NewEndLoc;
1544 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1545 /*consumeLastToken=*/false,
1547 if (NewType.isUsable())
1549 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1553 Tok.setKind(tok::annot_typename);
1554 setTypeAnnotation(Tok, Ty);
1555 Tok.setAnnotationEndLoc(Tok.getLocation());
1556 Tok.setLocation(BeginLoc);
1557 PP.AnnotateCachedTokens(Tok);
1561 case Sema::NC_Expression:
1562 Tok.setKind(tok::annot_primary_expr);
1563 setExprAnnotation(Tok, Classification.getExpression());
1564 Tok.setAnnotationEndLoc(NameLoc);
1565 if (SS.isNotEmpty())
1566 Tok.setLocation(SS.getBeginLoc());
1567 PP.AnnotateCachedTokens(Tok);
1570 case Sema::NC_TypeTemplate:
1571 if (Next.isNot(tok::less)) {
1572 // This may be a type template being used as a template template argument.
1573 if (SS.isNotEmpty())
1574 AnnotateScopeToken(SS, !WasScopeAnnotation);
1575 return ANK_TemplateName;
1578 case Sema::NC_VarTemplate:
1579 case Sema::NC_FunctionTemplate: {
1580 // We have a type, variable or function template followed by '<'.
1583 Id.setIdentifier(Name, NameLoc);
1584 if (AnnotateTemplateIdToken(
1585 TemplateTy::make(Classification.getTemplateName()),
1586 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1591 case Sema::NC_NestedNameSpecifier:
1592 llvm_unreachable("already parsed nested name specifier");
1595 // Unable to classify the name, but maybe we can annotate a scope specifier.
1596 if (SS.isNotEmpty())
1597 AnnotateScopeToken(SS, !WasScopeAnnotation);
1598 return ANK_Unresolved;
1601 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1602 assert(Tok.isNot(tok::identifier));
1603 Diag(Tok, diag::ext_keyword_as_ident)
1604 << PP.getSpelling(Tok)
1607 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1608 Tok.setKind(tok::identifier);
1612 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1613 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1614 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1615 /// with a single annotation token representing the typename or C++ scope
1617 /// This simplifies handling of C++ scope specifiers and allows efficient
1618 /// backtracking without the need to re-parse and resolve nested-names and
1620 /// It will mainly be called when we expect to treat identifiers as typenames
1621 /// (if they are typenames). For example, in C we do not expect identifiers
1622 /// inside expressions to be treated as typenames so it will not be called
1623 /// for expressions in C.
1624 /// The benefit for C/ObjC is that a typename will be annotated and
1625 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1626 /// will not be called twice, once to check whether we have a declaration
1627 /// specifier, and another one to get the actual type inside
1628 /// ParseDeclarationSpecifiers).
1630 /// This returns true if an error occurred.
1632 /// Note that this routine emits an error if you call it with ::new or ::delete
1633 /// as the current tokens, so only call it in contexts where these are invalid.
1634 bool Parser::TryAnnotateTypeOrScopeToken() {
1635 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1636 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1637 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1638 Tok.is(tok::kw___super)) &&
1639 "Cannot be a type or scope token!");
1641 if (Tok.is(tok::kw_typename)) {
1642 // MSVC lets you do stuff like:
1643 // typename typedef T_::D D;
1645 // We will consume the typedef token here and put it back after we have
1646 // parsed the first identifier, transforming it into something more like:
1647 // typename T_::D typedef D;
1648 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1650 PP.Lex(TypedefToken);
1651 bool Result = TryAnnotateTypeOrScopeToken();
1655 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1659 // Parse a C++ typename-specifier, e.g., "typename T::type".
1661 // typename-specifier:
1662 // 'typename' '::' [opt] nested-name-specifier identifier
1663 // 'typename' '::' [opt] nested-name-specifier template [opt]
1664 // simple-template-id
1665 SourceLocation TypenameLoc = ConsumeToken();
1667 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1668 /*EnteringContext=*/false, nullptr,
1669 /*IsTypename*/ true))
1672 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1673 Tok.is(tok::annot_decltype)) {
1674 // Attempt to recover by skipping the invalid 'typename'
1675 if (Tok.is(tok::annot_decltype) ||
1676 (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1677 unsigned DiagID = diag::err_expected_qualified_after_typename;
1678 // MS compatibility: MSVC permits using known types with typename.
1679 // e.g. "typedef typename T* pointer_type"
1680 if (getLangOpts().MicrosoftExt)
1681 DiagID = diag::warn_expected_qualified_after_typename;
1682 Diag(Tok.getLocation(), DiagID);
1686 if (Tok.isEditorPlaceholder())
1689 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1694 if (Tok.is(tok::identifier)) {
1695 // FIXME: check whether the next token is '<', first!
1696 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1697 *Tok.getIdentifierInfo(),
1699 } else if (Tok.is(tok::annot_template_id)) {
1700 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1701 if (TemplateId->Kind != TNK_Type_template &&
1702 TemplateId->Kind != TNK_Dependent_template_name) {
1703 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1704 << Tok.getAnnotationRange();
1708 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1709 TemplateId->NumArgs);
1711 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1712 TemplateId->TemplateKWLoc,
1713 TemplateId->Template,
1715 TemplateId->TemplateNameLoc,
1716 TemplateId->LAngleLoc,
1718 TemplateId->RAngleLoc);
1720 Diag(Tok, diag::err_expected_type_name_after_typename)
1725 SourceLocation EndLoc = Tok.getLastLoc();
1726 Tok.setKind(tok::annot_typename);
1727 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1728 Tok.setAnnotationEndLoc(EndLoc);
1729 Tok.setLocation(TypenameLoc);
1730 PP.AnnotateCachedTokens(Tok);
1734 // Remembers whether the token was originally a scope annotation.
1735 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1738 if (getLangOpts().CPlusPlus)
1739 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
1742 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1745 /// \brief Try to annotate a type or scope token, having already parsed an
1746 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1747 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1748 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
1750 if (Tok.is(tok::identifier)) {
1751 // Determine whether the identifier is a type name.
1752 if (ParsedType Ty = Actions.getTypeName(
1753 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1754 false, NextToken().is(tok::period), nullptr,
1755 /*IsCtorOrDtorName=*/false,
1756 /*NonTrivialTypeSourceInfo*/ true,
1757 /*IsClassTemplateDeductionContext*/GreaterThanIsOperator)) {
1758 SourceLocation BeginLoc = Tok.getLocation();
1759 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1760 BeginLoc = SS.getBeginLoc();
1762 /// An Objective-C object type followed by '<' is a specialization of
1763 /// a parameterized class type or a protocol-qualified type.
1764 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1765 (Ty.get()->isObjCObjectType() ||
1766 Ty.get()->isObjCObjectPointerType())) {
1767 // Consume the name.
1768 SourceLocation IdentifierLoc = ConsumeToken();
1769 SourceLocation NewEndLoc;
1771 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1772 /*consumeLastToken=*/false,
1774 if (NewType.isUsable())
1776 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1780 // This is a typename. Replace the current token in-place with an
1781 // annotation type token.
1782 Tok.setKind(tok::annot_typename);
1783 setTypeAnnotation(Tok, Ty);
1784 Tok.setAnnotationEndLoc(Tok.getLocation());
1785 Tok.setLocation(BeginLoc);
1787 // In case the tokens were cached, have Preprocessor replace
1788 // them with the annotation token.
1789 PP.AnnotateCachedTokens(Tok);
1793 if (!getLangOpts().CPlusPlus) {
1794 // If we're in C, we can't have :: tokens at all (the lexer won't return
1795 // them). If the identifier is not a type, then it can't be scope either,
1800 // If this is a template-id, annotate with a template-id or type token.
1801 if (NextToken().is(tok::less)) {
1802 TemplateTy Template;
1803 UnqualifiedId TemplateName;
1804 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1805 bool MemberOfUnknownSpecialization;
1806 if (TemplateNameKind TNK = Actions.isTemplateName(
1808 /*hasTemplateKeyword=*/false, TemplateName,
1809 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1810 MemberOfUnknownSpecialization)) {
1811 // Consume the identifier.
1813 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1815 // If an unrecoverable error occurred, we need to return true here,
1816 // because the token stream is in a damaged state. We may not return
1817 // a valid identifier.
1823 // The current token, which is either an identifier or a
1824 // template-id, is not part of the annotation. Fall through to
1825 // push that token back into the stream and complete the C++ scope
1826 // specifier annotation.
1829 if (Tok.is(tok::annot_template_id)) {
1830 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1831 if (TemplateId->Kind == TNK_Type_template) {
1832 // A template-id that refers to a type was parsed into a
1833 // template-id annotation in a context where we weren't allowed
1834 // to produce a type annotation token. Update the template-id
1835 // annotation token to a type annotation token now.
1836 AnnotateTemplateIdTokenAsType();
1844 // A C++ scope specifier that isn't followed by a typename.
1845 AnnotateScopeToken(SS, IsNewScope);
1849 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1850 /// annotates C++ scope specifiers and template-ids. This returns
1851 /// true if there was an error that could not be recovered from.
1853 /// Note that this routine emits an error if you call it with ::new or ::delete
1854 /// as the current tokens, so only call it in contexts where these are invalid.
1855 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1856 assert(getLangOpts().CPlusPlus &&
1857 "Call sites of this function should be guarded by checking for C++");
1858 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1859 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1860 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1861 "Cannot be a type or scope token!");
1864 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1869 AnnotateScopeToken(SS, true);
1873 bool Parser::isTokenEqualOrEqualTypo() {
1874 tok::TokenKind Kind = Tok.getKind();
1878 case tok::ampequal: // &=
1879 case tok::starequal: // *=
1880 case tok::plusequal: // +=
1881 case tok::minusequal: // -=
1882 case tok::exclaimequal: // !=
1883 case tok::slashequal: // /=
1884 case tok::percentequal: // %=
1885 case tok::lessequal: // <=
1886 case tok::lesslessequal: // <<=
1887 case tok::greaterequal: // >=
1888 case tok::greatergreaterequal: // >>=
1889 case tok::caretequal: // ^=
1890 case tok::pipeequal: // |=
1891 case tok::equalequal: // ==
1892 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1894 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1900 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1901 assert(Tok.is(tok::code_completion));
1902 PrevTokLocation = Tok.getLocation();
1904 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1905 if (S->getFlags() & Scope::FnScope) {
1906 Actions.CodeCompleteOrdinaryName(getCurScope(),
1907 Sema::PCC_RecoveryInFunction);
1909 return PrevTokLocation;
1912 if (S->getFlags() & Scope::ClassScope) {
1913 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1915 return PrevTokLocation;
1919 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1921 return PrevTokLocation;
1924 // Code-completion pass-through functions
1926 void Parser::CodeCompleteDirective(bool InConditional) {
1927 Actions.CodeCompletePreprocessorDirective(InConditional);
1930 void Parser::CodeCompleteInConditionalExclusion() {
1931 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1934 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1935 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1938 void Parser::CodeCompletePreprocessorExpression() {
1939 Actions.CodeCompletePreprocessorExpression();
1942 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1943 MacroInfo *MacroInfo,
1944 unsigned ArgumentIndex) {
1945 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1949 void Parser::CodeCompleteNaturalLanguage() {
1950 Actions.CodeCompleteNaturalLanguage();
1953 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1954 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1955 "Expected '__if_exists' or '__if_not_exists'");
1956 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1957 Result.KeywordLoc = ConsumeToken();
1959 BalancedDelimiterTracker T(*this, tok::l_paren);
1960 if (T.consumeOpen()) {
1961 Diag(Tok, diag::err_expected_lparen_after)
1962 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1966 // Parse nested-name-specifier.
1967 if (getLangOpts().CPlusPlus)
1968 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1969 /*EnteringContext=*/false);
1971 // Check nested-name specifier.
1972 if (Result.SS.isInvalid()) {
1977 // Parse the unqualified-id.
1978 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1979 if (ParseUnqualifiedId(
1980 Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
1981 /*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
1982 TemplateKWLoc, Result.Name)) {
1987 if (T.consumeClose())
1990 // Check if the symbol exists.
1991 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1992 Result.IsIfExists, Result.SS,
1994 case Sema::IER_Exists:
1995 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1998 case Sema::IER_DoesNotExist:
1999 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
2002 case Sema::IER_Dependent:
2003 Result.Behavior = IEB_Dependent;
2006 case Sema::IER_Error:
2013 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2014 IfExistsCondition Result;
2015 if (ParseMicrosoftIfExistsCondition(Result))
2018 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2019 if (Braces.consumeOpen()) {
2020 Diag(Tok, diag::err_expected) << tok::l_brace;
2024 switch (Result.Behavior) {
2026 // Parse declarations below.
2030 llvm_unreachable("Cannot have a dependent external declaration");
2037 // Parse the declarations.
2038 // FIXME: Support module import within __if_exists?
2039 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2040 ParsedAttributesWithRange attrs(AttrFactory);
2041 MaybeParseCXX11Attributes(attrs);
2042 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2043 if (Result && !getCurScope()->getParent())
2044 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2046 Braces.consumeClose();
2049 /// Parse a C++ Modules TS module declaration, which appears at the beginning
2050 /// of a module interface, module partition, or module implementation file.
2052 /// module-declaration: [Modules TS + P0273R0]
2053 /// 'module' module-kind[opt] module-name attribute-specifier-seq[opt] ';'
2055 /// 'implementation'
2058 /// Note that the module-kind values are context-sensitive keywords.
2059 Parser::DeclGroupPtrTy Parser::ParseModuleDecl() {
2060 assert(Tok.is(tok::kw_module) && getLangOpts().ModulesTS &&
2061 "should not be parsing a module declaration");
2062 SourceLocation ModuleLoc = ConsumeToken();
2064 // Check for a module-kind.
2065 Sema::ModuleDeclKind MDK = Sema::ModuleDeclKind::Module;
2066 if (Tok.is(tok::identifier) && NextToken().is(tok::identifier)) {
2067 if (Tok.getIdentifierInfo()->isStr("implementation"))
2068 MDK = Sema::ModuleDeclKind::Implementation;
2069 else if (Tok.getIdentifierInfo()->isStr("partition"))
2070 MDK = Sema::ModuleDeclKind::Partition;
2072 Diag(Tok, diag::err_unexpected_module_kind) << Tok.getIdentifierInfo();
2073 SkipUntil(tok::semi);
2079 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2080 if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2083 ParsedAttributesWithRange Attrs(AttrFactory);
2084 MaybeParseCXX11Attributes(Attrs);
2085 // We don't support any module attributes yet.
2086 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2088 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2090 return Actions.ActOnModuleDecl(ModuleLoc, MDK, Path);
2093 /// Parse a module import declaration. This is essentially the same for
2094 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2095 /// and the trailing optional attributes (in C++).
2097 /// [ObjC] @import declaration:
2098 /// '@' 'import' module-name ';'
2099 /// [ModTS] module-import-declaration:
2100 /// 'import' module-name attribute-specifier-seq[opt] ';'
2101 Parser::DeclGroupPtrTy Parser::ParseModuleImport(SourceLocation AtLoc) {
2102 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2103 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2104 "Improper start to module import");
2105 SourceLocation ImportLoc = ConsumeToken();
2106 SourceLocation StartLoc = AtLoc.isInvalid() ? ImportLoc : AtLoc;
2108 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2109 if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2112 ParsedAttributesWithRange Attrs(AttrFactory);
2113 MaybeParseCXX11Attributes(Attrs);
2114 // We don't support any module import attributes yet.
2115 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2117 if (PP.hadModuleLoaderFatalFailure()) {
2118 // With a fatal failure in the module loader, we abort parsing.
2123 DeclResult Import = Actions.ActOnModuleImport(StartLoc, ImportLoc, Path);
2124 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2125 if (Import.isInvalid())
2128 return Actions.ConvertDeclToDeclGroup(Import.get());
2131 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2135 /// module-name-qualifier[opt] identifier
2136 /// module-name-qualifier:
2137 /// module-name-qualifier[opt] identifier '.'
2138 bool Parser::ParseModuleName(
2139 SourceLocation UseLoc,
2140 SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2142 // Parse the module path.
2144 if (!Tok.is(tok::identifier)) {
2145 if (Tok.is(tok::code_completion)) {
2146 Actions.CodeCompleteModuleImport(UseLoc, Path);
2151 Diag(Tok, diag::err_module_expected_ident) << IsImport;
2152 SkipUntil(tok::semi);
2156 // Record this part of the module path.
2157 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2160 if (Tok.isNot(tok::period))
2167 /// \brief Try recover parser when module annotation appears where it must not
2169 /// \returns false if the recover was successful and parsing may be continued, or
2170 /// true if parser must bail out to top level and handle the token there.
2171 bool Parser::parseMisplacedModuleImport() {
2173 switch (Tok.getKind()) {
2174 case tok::annot_module_end:
2175 // If we recovered from a misplaced module begin, we expect to hit a
2176 // misplaced module end too. Stay in the current context when this
2178 if (MisplacedModuleBeginCount) {
2179 --MisplacedModuleBeginCount;
2180 Actions.ActOnModuleEnd(Tok.getLocation(),
2181 reinterpret_cast<Module *>(
2182 Tok.getAnnotationValue()));
2186 // Inform caller that recovery failed, the error must be handled at upper
2187 // level. This will generate the desired "missing '}' at end of module"
2188 // diagnostics on the way out.
2190 case tok::annot_module_begin:
2191 // Recover by entering the module (Sema will diagnose).
2192 Actions.ActOnModuleBegin(Tok.getLocation(),
2193 reinterpret_cast<Module *>(
2194 Tok.getAnnotationValue()));
2196 ++MisplacedModuleBeginCount;
2198 case tok::annot_module_include:
2199 // Module import found where it should not be, for instance, inside a
2200 // namespace. Recover by importing the module.
2201 Actions.ActOnModuleInclude(Tok.getLocation(),
2202 reinterpret_cast<Module *>(
2203 Tok.getAnnotationValue()));
2205 // If there is another module import, process it.
2214 bool BalancedDelimiterTracker::diagnoseOverflow() {
2215 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2216 << P.getLangOpts().BracketDepth;
2217 P.Diag(P.Tok, diag::note_bracket_depth);
2222 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2224 tok::TokenKind SkipToTok) {
2225 LOpen = P.Tok.getLocation();
2226 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2227 if (SkipToTok != tok::unknown)
2228 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2232 if (getDepth() < MaxDepth)
2235 return diagnoseOverflow();
2238 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2239 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2241 if (P.Tok.is(tok::annot_module_end))
2242 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2244 P.Diag(P.Tok, diag::err_expected) << Close;
2245 P.Diag(LOpen, diag::note_matching) << Kind;
2247 // If we're not already at some kind of closing bracket, skip to our closing
2249 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2250 P.Tok.isNot(tok::r_square) &&
2251 P.SkipUntil(Close, FinalToken,
2252 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2254 LClose = P.ConsumeAnyToken();
2258 void BalancedDelimiterTracker::skipToEnd() {
2259 P.SkipUntil(Close, Parser::StopBeforeMatch);