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 "RAIIObjectsForParser.h"
16 #include "clang/AST/ASTConsumer.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/Parse/ParseDiagnostic.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/ParsedTemplate.h"
22 #include "clang/Sema/Scope.h"
23 #include "llvm/Support/raw_ostream.h"
24 using namespace clang;
28 /// \brief 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);
42 /// \brief RAIIObject to destroy the contents of a SmallVector of
43 /// TemplateIdAnnotation pointers and clear the vector.
44 class DestroyTemplateIdAnnotationsRAIIObj {
45 SmallVectorImpl<TemplateIdAnnotation *> &Container;
48 DestroyTemplateIdAnnotationsRAIIObj(
49 SmallVectorImpl<TemplateIdAnnotation *> &Container)
50 : Container(Container) {}
52 ~DestroyTemplateIdAnnotationsRAIIObj() {
53 for (SmallVectorImpl<TemplateIdAnnotation *>::iterator I =
61 } // end anonymous namespace
63 IdentifierInfo *Parser::getSEHExceptKeyword() {
64 // __except is accepted as a (contextual) keyword
65 if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
66 Ident__except = PP.getIdentifierInfo("__except");
71 Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
72 : PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
73 GreaterThanIsOperator(true), ColonIsSacred(false),
74 InMessageExpression(false), TemplateParameterDepth(0),
75 ParsingInObjCContainer(false) {
76 SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
78 Tok.setKind(tok::eof);
79 Actions.CurScope = nullptr;
81 ParenCount = BracketCount = BraceCount = 0;
82 CurParsedObjCImpl = nullptr;
84 // Add #pragma handlers. These are removed and destroyed in the
86 initializePragmaHandlers();
88 CommentSemaHandler.reset(new ActionCommentHandler(actions));
89 PP.addCommentHandler(CommentSemaHandler.get());
91 PP.setCodeCompletionHandler(*this);
94 DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
95 return Diags.Report(Loc, DiagID);
98 DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
99 return Diag(Tok.getLocation(), DiagID);
102 /// \brief Emits a diagnostic suggesting parentheses surrounding a
105 /// \param Loc The location where we'll emit the diagnostic.
106 /// \param DK The kind of diagnostic to emit.
107 /// \param ParenRange Source range enclosing code that should be parenthesized.
108 void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
109 SourceRange ParenRange) {
110 SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
111 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
112 // We can't display the parentheses, so just dig the
113 // warning/error and return.
119 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
120 << FixItHint::CreateInsertion(EndLoc, ")");
123 static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
124 switch (ExpectedTok) {
126 return Tok.is(tok::colon) || Tok.is(tok::comma); // : or , for ;
127 default: return false;
131 bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
133 if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) {
138 // Detect common single-character typos and resume.
139 if (IsCommonTypo(ExpectedTok, Tok)) {
140 SourceLocation Loc = Tok.getLocation();
142 DiagnosticBuilder DB = Diag(Loc, DiagID);
143 DB << FixItHint::CreateReplacement(
144 SourceRange(Loc), tok::getPunctuatorSpelling(ExpectedTok));
145 if (DiagID == diag::err_expected)
147 else if (DiagID == diag::err_expected_after)
148 DB << Msg << ExpectedTok;
153 // Pretend there wasn't a problem.
158 SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
159 const char *Spelling = nullptr;
160 if (EndLoc.isValid())
161 Spelling = tok::getPunctuatorSpelling(ExpectedTok);
163 DiagnosticBuilder DB =
165 ? Diag(EndLoc, DiagID) << FixItHint::CreateInsertion(EndLoc, Spelling)
167 if (DiagID == diag::err_expected)
169 else if (DiagID == diag::err_expected_after)
170 DB << Msg << ExpectedTok;
177 bool Parser::ExpectAndConsumeSemi(unsigned DiagID) {
178 if (TryConsumeToken(tok::semi))
181 if (Tok.is(tok::code_completion)) {
182 handleUnexpectedCodeCompletionToken();
186 if ((Tok.is(tok::r_paren) || Tok.is(tok::r_square)) &&
187 NextToken().is(tok::semi)) {
188 Diag(Tok, diag::err_extraneous_token_before_semi)
189 << PP.getSpelling(Tok)
190 << FixItHint::CreateRemoval(Tok.getLocation());
191 ConsumeAnyToken(); // The ')' or ']'.
192 ConsumeToken(); // The ';'.
196 return ExpectAndConsume(tok::semi, DiagID);
199 void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, unsigned TST) {
200 if (!Tok.is(tok::semi)) return;
202 bool HadMultipleSemis = false;
203 SourceLocation StartLoc = Tok.getLocation();
204 SourceLocation EndLoc = Tok.getLocation();
207 while ((Tok.is(tok::semi) && !Tok.isAtStartOfLine())) {
208 HadMultipleSemis = true;
209 EndLoc = Tok.getLocation();
213 // C++11 allows extra semicolons at namespace scope, but not in any of the
215 if (Kind == OutsideFunction && getLangOpts().CPlusPlus) {
216 if (getLangOpts().CPlusPlus11)
217 Diag(StartLoc, diag::warn_cxx98_compat_top_level_semi)
218 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
220 Diag(StartLoc, diag::ext_extra_semi_cxx11)
221 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
225 if (Kind != AfterMemberFunctionDefinition || HadMultipleSemis)
226 Diag(StartLoc, diag::ext_extra_semi)
227 << Kind << DeclSpec::getSpecifierName((DeclSpec::TST)TST,
228 Actions.getASTContext().getPrintingPolicy())
229 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
231 // A single semicolon is valid after a member function definition.
232 Diag(StartLoc, diag::warn_extra_semi_after_mem_fn_def)
233 << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
236 //===----------------------------------------------------------------------===//
238 //===----------------------------------------------------------------------===//
240 static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
241 return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
244 /// SkipUntil - Read tokens until we get to the specified token, then consume
245 /// it (unless no flag StopBeforeMatch). Because we cannot guarantee that the
246 /// token will ever occur, this skips to the next token, or to some likely
247 /// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
250 /// If SkipUntil finds the specified token, it returns true, otherwise it
252 bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
253 // We always want this function to skip at least one token if the first token
254 // isn't T and if not at EOF.
255 bool isFirstTokenSkipped = true;
257 // If we found one of the tokens, stop and return true.
258 for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
259 if (Tok.is(Toks[i])) {
260 if (HasFlagsSet(Flags, StopBeforeMatch)) {
261 // Noop, don't consume the token.
269 // Important special case: The caller has given up and just wants us to
270 // skip the rest of the file. Do this without recursing, since we can
271 // get here precisely because the caller detected too much recursion.
272 if (Toks.size() == 1 && Toks[0] == tok::eof &&
273 !HasFlagsSet(Flags, StopAtSemi) &&
274 !HasFlagsSet(Flags, StopAtCodeCompletion)) {
275 while (Tok.isNot(tok::eof))
280 switch (Tok.getKind()) {
282 // Ran out of tokens.
285 case tok::annot_pragma_openmp:
286 case tok::annot_pragma_openmp_end:
287 // Stop before an OpenMP pragma boundary.
288 case tok::annot_module_begin:
289 case tok::annot_module_end:
290 case tok::annot_module_include:
291 // Stop before we change submodules. They generally indicate a "good"
292 // place to pick up parsing again (except in the special case where
293 // we're trying to skip to EOF).
296 case tok::code_completion:
297 if (!HasFlagsSet(Flags, StopAtCodeCompletion))
298 handleUnexpectedCodeCompletionToken();
302 // Recursively skip properly-nested parens.
304 if (HasFlagsSet(Flags, StopAtCodeCompletion))
305 SkipUntil(tok::r_paren, StopAtCodeCompletion);
307 SkipUntil(tok::r_paren);
310 // Recursively skip properly-nested square brackets.
312 if (HasFlagsSet(Flags, StopAtCodeCompletion))
313 SkipUntil(tok::r_square, StopAtCodeCompletion);
315 SkipUntil(tok::r_square);
318 // Recursively skip properly-nested braces.
320 if (HasFlagsSet(Flags, StopAtCodeCompletion))
321 SkipUntil(tok::r_brace, StopAtCodeCompletion);
323 SkipUntil(tok::r_brace);
326 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
327 // Since the user wasn't looking for this token (if they were, it would
328 // already be handled), this isn't balanced. If there is a LHS token at a
329 // higher level, we will assume that this matches the unbalanced token
330 // and return it. Otherwise, this is a spurious RHS token, which we skip.
332 if (ParenCount && !isFirstTokenSkipped)
333 return false; // Matches something.
337 if (BracketCount && !isFirstTokenSkipped)
338 return false; // Matches something.
342 if (BraceCount && !isFirstTokenSkipped)
343 return false; // Matches something.
347 case tok::string_literal:
348 case tok::wide_string_literal:
349 case tok::utf8_string_literal:
350 case tok::utf16_string_literal:
351 case tok::utf32_string_literal:
352 ConsumeStringToken();
356 if (HasFlagsSet(Flags, StopAtSemi))
364 isFirstTokenSkipped = false;
368 //===----------------------------------------------------------------------===//
369 // Scope manipulation
370 //===----------------------------------------------------------------------===//
372 /// EnterScope - Start a new scope.
373 void Parser::EnterScope(unsigned ScopeFlags) {
374 if (NumCachedScopes) {
375 Scope *N = ScopeCache[--NumCachedScopes];
376 N->Init(getCurScope(), ScopeFlags);
377 Actions.CurScope = N;
379 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
383 /// ExitScope - Pop a scope off the scope stack.
384 void Parser::ExitScope() {
385 assert(getCurScope() && "Scope imbalance!");
387 // Inform the actions module that this scope is going away if there are any
389 Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
391 Scope *OldScope = getCurScope();
392 Actions.CurScope = OldScope->getParent();
394 if (NumCachedScopes == ScopeCacheSize)
397 ScopeCache[NumCachedScopes++] = OldScope;
400 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
401 /// this object does nothing.
402 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
404 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
406 OldFlags = CurScope->getFlags();
407 CurScope->setFlags(ScopeFlags);
411 /// Restore the flags for the current scope to what they were before this
412 /// object overrode them.
413 Parser::ParseScopeFlags::~ParseScopeFlags() {
415 CurScope->setFlags(OldFlags);
419 //===----------------------------------------------------------------------===//
420 // C99 6.9: External Definitions.
421 //===----------------------------------------------------------------------===//
424 // If we still have scopes active, delete the scope tree.
425 delete getCurScope();
426 Actions.CurScope = nullptr;
428 // Free the scope cache.
429 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
430 delete ScopeCache[i];
432 resetPragmaHandlers();
434 PP.removeCommentHandler(CommentSemaHandler.get());
436 PP.clearCodeCompletionHandler();
438 if (getLangOpts().DelayedTemplateParsing &&
439 !PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
440 // If an ASTConsumer parsed delay-parsed templates in their
441 // HandleTranslationUnit() method, TemplateIds created there were not
442 // guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
443 // ParseTopLevelDecl(). Destroy them here.
444 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
447 assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
450 /// Initialize - Warm up the parser.
452 void Parser::Initialize() {
453 // Create the translation unit scope. Install it as the current scope.
454 assert(getCurScope() == nullptr && "A scope is already active?");
455 EnterScope(Scope::DeclScope);
456 Actions.ActOnTranslationUnitScope(getCurScope());
458 // Initialization for Objective-C context sensitive keywords recognition.
459 // Referenced in Parser::ParseObjCTypeQualifierList.
460 if (getLangOpts().ObjC1) {
461 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
462 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
463 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
464 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
465 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
466 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
467 ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
468 ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
469 ObjCTypeQuals[objc_null_unspecified]
470 = &PP.getIdentifierTable().get("null_unspecified");
473 Ident_instancetype = nullptr;
474 Ident_final = nullptr;
475 Ident_sealed = nullptr;
476 Ident_override = nullptr;
478 Ident_super = &PP.getIdentifierTable().get("super");
480 Ident_vector = nullptr;
481 Ident_bool = nullptr;
482 Ident_pixel = nullptr;
483 if (getLangOpts().AltiVec || getLangOpts().ZVector) {
484 Ident_vector = &PP.getIdentifierTable().get("vector");
485 Ident_bool = &PP.getIdentifierTable().get("bool");
487 if (getLangOpts().AltiVec)
488 Ident_pixel = &PP.getIdentifierTable().get("pixel");
490 Ident_introduced = nullptr;
491 Ident_deprecated = nullptr;
492 Ident_obsoleted = nullptr;
493 Ident_unavailable = nullptr;
495 Ident__except = nullptr;
497 Ident__exception_code = Ident__exception_info = nullptr;
498 Ident__abnormal_termination = Ident___exception_code = nullptr;
499 Ident___exception_info = Ident___abnormal_termination = nullptr;
500 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
501 Ident_AbnormalTermination = nullptr;
503 if(getLangOpts().Borland) {
504 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
505 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
506 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
507 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
508 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
509 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
510 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
511 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
512 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
514 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
515 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
516 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
517 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
518 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
519 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
520 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
521 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
522 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
525 Actions.Initialize();
527 // Prime the lexer look-ahead.
531 void Parser::LateTemplateParserCleanupCallback(void *P) {
532 // While this RAII helper doesn't bracket any actual work, the destructor will
533 // clean up annotations that were created during ActOnEndOfTranslationUnit
534 // when incremental processing is enabled.
535 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
538 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
539 /// action tells us to. This returns true if the EOF was encountered.
540 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
541 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
543 // Skip over the EOF token, flagging end of previous input for incremental
545 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
548 Result = DeclGroupPtrTy();
549 switch (Tok.getKind()) {
550 case tok::annot_pragma_unused:
551 HandlePragmaUnused();
554 case tok::annot_module_include:
555 Actions.ActOnModuleInclude(Tok.getLocation(),
556 reinterpret_cast<Module *>(
557 Tok.getAnnotationValue()));
561 case tok::annot_module_begin:
562 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
563 Tok.getAnnotationValue()));
567 case tok::annot_module_end:
568 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
569 Tok.getAnnotationValue()));
574 // Late template parsing can begin.
575 if (getLangOpts().DelayedTemplateParsing)
576 Actions.SetLateTemplateParser(LateTemplateParserCallback,
577 PP.isIncrementalProcessingEnabled() ?
578 LateTemplateParserCleanupCallback : nullptr,
580 if (!PP.isIncrementalProcessingEnabled())
581 Actions.ActOnEndOfTranslationUnit();
582 //else don't tell Sema that we ended parsing: more input might come.
589 ParsedAttributesWithRange attrs(AttrFactory);
590 MaybeParseCXX11Attributes(attrs);
591 MaybeParseMicrosoftAttributes(attrs);
593 Result = ParseExternalDeclaration(attrs);
597 /// ParseExternalDeclaration:
599 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
600 /// function-definition
602 /// [GNU] asm-definition
603 /// [GNU] __extension__ external-declaration
604 /// [OBJC] objc-class-definition
605 /// [OBJC] objc-class-declaration
606 /// [OBJC] objc-alias-declaration
607 /// [OBJC] objc-protocol-definition
608 /// [OBJC] objc-method-definition
610 /// [C++] linkage-specification
611 /// [GNU] asm-definition:
612 /// simple-asm-expr ';'
613 /// [C++11] empty-declaration
614 /// [C++11] attribute-declaration
616 /// [C++11] empty-declaration:
619 /// [C++0x/GNU] 'extern' 'template' declaration
620 Parser::DeclGroupPtrTy
621 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
622 ParsingDeclSpec *DS) {
623 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
624 ParenBraceBracketBalancer BalancerRAIIObj(*this);
626 if (PP.isCodeCompletionReached()) {
628 return DeclGroupPtrTy();
631 Decl *SingleDecl = nullptr;
632 switch (Tok.getKind()) {
633 case tok::annot_pragma_vis:
634 HandlePragmaVisibility();
635 return DeclGroupPtrTy();
636 case tok::annot_pragma_pack:
638 return DeclGroupPtrTy();
639 case tok::annot_pragma_msstruct:
640 HandlePragmaMSStruct();
641 return DeclGroupPtrTy();
642 case tok::annot_pragma_align:
644 return DeclGroupPtrTy();
645 case tok::annot_pragma_weak:
647 return DeclGroupPtrTy();
648 case tok::annot_pragma_weakalias:
649 HandlePragmaWeakAlias();
650 return DeclGroupPtrTy();
651 case tok::annot_pragma_redefine_extname:
652 HandlePragmaRedefineExtname();
653 return DeclGroupPtrTy();
654 case tok::annot_pragma_fp_contract:
655 HandlePragmaFPContract();
656 return DeclGroupPtrTy();
657 case tok::annot_pragma_opencl_extension:
658 HandlePragmaOpenCLExtension();
659 return DeclGroupPtrTy();
660 case tok::annot_pragma_openmp:
661 return ParseOpenMPDeclarativeDirective();
662 case tok::annot_pragma_ms_pointers_to_members:
663 HandlePragmaMSPointersToMembers();
664 return DeclGroupPtrTy();
665 case tok::annot_pragma_ms_vtordisp:
666 HandlePragmaMSVtorDisp();
667 return DeclGroupPtrTy();
668 case tok::annot_pragma_ms_pragma:
669 HandlePragmaMSPragma();
670 return DeclGroupPtrTy();
671 case tok::annot_pragma_dump:
673 return DeclGroupPtrTy();
675 // Either a C++11 empty-declaration or attribute-declaration.
676 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
679 ConsumeExtraSemi(OutsideFunction);
682 Diag(Tok, diag::err_extraneous_closing_brace);
684 return DeclGroupPtrTy();
686 Diag(Tok, diag::err_expected_external_declaration);
687 return DeclGroupPtrTy();
688 case tok::kw___extension__: {
689 // __extension__ silences extension warnings in the subexpression.
690 ExtensionRAIIObject O(Diags); // Use RAII to do this.
692 return ParseExternalDeclaration(attrs);
695 ProhibitAttributes(attrs);
697 SourceLocation StartLoc = Tok.getLocation();
698 SourceLocation EndLoc;
700 ExprResult Result(ParseSimpleAsm(&EndLoc));
702 // Check if GNU-style InlineAsm is disabled.
703 // Empty asm string is allowed because it will not introduce
704 // any assembly code.
705 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
706 const auto *SL = cast<StringLiteral>(Result.get());
707 if (!SL->getString().trim().empty())
708 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
711 ExpectAndConsume(tok::semi, diag::err_expected_after,
712 "top-level asm block");
714 if (Result.isInvalid())
715 return DeclGroupPtrTy();
716 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
720 return ParseObjCAtDirectives();
723 if (!getLangOpts().ObjC1) {
724 Diag(Tok, diag::err_expected_external_declaration);
726 return DeclGroupPtrTy();
728 SingleDecl = ParseObjCMethodDefinition();
730 case tok::code_completion:
731 Actions.CodeCompleteOrdinaryName(getCurScope(),
732 CurParsedObjCImpl? Sema::PCC_ObjCImplementation
733 : Sema::PCC_Namespace);
735 return DeclGroupPtrTy();
737 case tok::kw_namespace:
738 case tok::kw_typedef:
739 case tok::kw_template:
740 case tok::kw_export: // As in 'export template'
741 case tok::kw_static_assert:
742 case tok::kw__Static_assert:
743 // A function definition cannot start with any of these keywords.
745 SourceLocation DeclEnd;
746 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
750 // Parse (then ignore) 'static' prior to a template instantiation. This is
751 // a GCC extension that we intentionally do not support.
752 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
753 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
755 SourceLocation DeclEnd;
756 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
761 if (getLangOpts().CPlusPlus) {
762 tok::TokenKind NextKind = NextToken().getKind();
764 // Inline namespaces. Allowed as an extension even in C++03.
765 if (NextKind == tok::kw_namespace) {
766 SourceLocation DeclEnd;
767 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
770 // Parse (then ignore) 'inline' prior to a template instantiation. This is
771 // a GCC extension that we intentionally do not support.
772 if (NextKind == tok::kw_template) {
773 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
775 SourceLocation DeclEnd;
776 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
782 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
784 SourceLocation ExternLoc = ConsumeToken();
785 SourceLocation TemplateLoc = ConsumeToken();
786 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
787 diag::warn_cxx98_compat_extern_template :
788 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
789 SourceLocation DeclEnd;
790 return Actions.ConvertDeclToDeclGroup(
791 ParseExplicitInstantiation(Declarator::FileContext,
792 ExternLoc, TemplateLoc, DeclEnd));
796 case tok::kw___if_exists:
797 case tok::kw___if_not_exists:
798 ParseMicrosoftIfExistsExternalDeclaration();
799 return DeclGroupPtrTy();
803 // We can't tell whether this is a function-definition or declaration yet.
804 return ParseDeclarationOrFunctionDefinition(attrs, DS);
807 // This routine returns a DeclGroup, if the thing we parsed only contains a
808 // single decl, convert it now.
809 return Actions.ConvertDeclToDeclGroup(SingleDecl);
812 /// \brief Determine whether the current token, if it occurs after a
813 /// declarator, continues a declaration or declaration list.
814 bool Parser::isDeclarationAfterDeclarator() {
815 // Check for '= delete' or '= default'
816 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
817 const Token &KW = NextToken();
818 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
822 return Tok.is(tok::equal) || // int X()= -> not a function def
823 Tok.is(tok::comma) || // int X(), -> not a function def
824 Tok.is(tok::semi) || // int X(); -> not a function def
825 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
826 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
827 (getLangOpts().CPlusPlus &&
828 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
831 /// \brief Determine whether the current token, if it occurs after a
832 /// declarator, indicates the start of a function definition.
833 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
834 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
835 if (Tok.is(tok::l_brace)) // int X() {}
838 // Handle K&R C argument lists: int X(f) int f; {}
839 if (!getLangOpts().CPlusPlus &&
840 Declarator.getFunctionTypeInfo().isKNRPrototype())
841 return isDeclarationSpecifier();
843 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
844 const Token &KW = NextToken();
845 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
848 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
849 Tok.is(tok::kw_try); // X() try { ... }
852 /// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or
853 /// a declaration. We can't tell which we have until we read up to the
854 /// compound-statement in function-definition. TemplateParams, if
855 /// non-NULL, provides the template parameters when we're parsing a
856 /// C++ template-declaration.
858 /// function-definition: [C99 6.9.1]
859 /// decl-specs declarator declaration-list[opt] compound-statement
860 /// [C90] function-definition: [C99 6.7.1] - implicit int result
861 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
863 /// declaration: [C99 6.7]
864 /// declaration-specifiers init-declarator-list[opt] ';'
865 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
866 /// [OMP] threadprivate-directive [TODO]
868 Parser::DeclGroupPtrTy
869 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
871 AccessSpecifier AS) {
872 // Parse the common declaration-specifiers piece.
873 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
875 // If we had a free-standing type definition with a missing semicolon, we
876 // may get this far before the problem becomes obvious.
877 if (DS.hasTagDefinition() &&
878 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
879 return DeclGroupPtrTy();
881 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
882 // declaration-specifiers init-declarator-list[opt] ';'
883 if (Tok.is(tok::semi)) {
884 ProhibitAttributes(attrs);
886 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
887 DS.complete(TheDecl);
888 return Actions.ConvertDeclToDeclGroup(TheDecl);
891 DS.takeAttributesFrom(attrs);
893 // ObjC2 allows prefix attributes on class interfaces and protocols.
894 // FIXME: This still needs better diagnostics. We should only accept
895 // attributes here, no types, etc.
896 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
897 SourceLocation AtLoc = ConsumeToken(); // the "@"
898 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
899 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
900 Diag(Tok, diag::err_objc_unexpected_attr);
901 SkipUntil(tok::semi); // FIXME: better skip?
902 return DeclGroupPtrTy();
907 const char *PrevSpec = nullptr;
909 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
910 Actions.getASTContext().getPrintingPolicy()))
911 Diag(AtLoc, DiagID) << PrevSpec;
913 if (Tok.isObjCAtKeyword(tok::objc_protocol))
914 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
916 return Actions.ConvertDeclToDeclGroup(
917 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
920 // If the declspec consisted only of 'extern' and we have a string
921 // literal following it, this must be a C++ linkage specifier like
923 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
924 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
925 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
926 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
927 return Actions.ConvertDeclToDeclGroup(TheDecl);
930 return ParseDeclGroup(DS, Declarator::FileContext);
933 Parser::DeclGroupPtrTy
934 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
936 AccessSpecifier AS) {
938 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
940 ParsingDeclSpec PDS(*this);
941 // Must temporarily exit the objective-c container scope for
942 // parsing c constructs and re-enter objc container scope
944 ObjCDeclContextSwitch ObjCDC(*this);
946 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
950 /// ParseFunctionDefinition - We parsed and verified that the specified
951 /// Declarator is well formed. If this is a K&R-style function, read the
952 /// parameters declaration-list, then start the compound-statement.
954 /// function-definition: [C99 6.9.1]
955 /// decl-specs declarator declaration-list[opt] compound-statement
956 /// [C90] function-definition: [C99 6.7.1] - implicit int result
957 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
958 /// [C++] function-definition: [C++ 8.4]
959 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
961 /// [C++] function-definition: [C++ 8.4]
962 /// decl-specifier-seq[opt] declarator function-try-block
964 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
965 const ParsedTemplateInfo &TemplateInfo,
966 LateParsedAttrList *LateParsedAttrs) {
967 // Poison SEH identifiers so they are flagged as illegal in function bodies.
968 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
969 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
971 // If this is C90 and the declspecs were completely missing, fudge in an
972 // implicit int. We do this here because this is the only place where
973 // declaration-specifiers are completely optional in the grammar.
974 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
975 const char *PrevSpec;
977 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
978 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
979 D.getIdentifierLoc(),
982 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
985 // If this declaration was formed with a K&R-style identifier list for the
986 // arguments, parse declarations for all of the args next.
987 // int foo(a,b) int a; float b; {}
988 if (FTI.isKNRPrototype())
989 ParseKNRParamDeclarations(D);
991 // We should have either an opening brace or, in a C++ constructor,
992 // we may have a colon.
993 if (Tok.isNot(tok::l_brace) &&
994 (!getLangOpts().CPlusPlus ||
995 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
996 Tok.isNot(tok::equal)))) {
997 Diag(Tok, diag::err_expected_fn_body);
999 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1000 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1002 // If we didn't find the '{', bail out.
1003 if (Tok.isNot(tok::l_brace))
1007 // Check to make sure that any normal attributes are allowed to be on
1008 // a definition. Late parsed attributes are checked at the end.
1009 if (Tok.isNot(tok::equal)) {
1010 AttributeList *DtorAttrs = D.getAttributes();
1012 if (DtorAttrs->isKnownToGCC() &&
1013 !DtorAttrs->isCXX11Attribute()) {
1014 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1015 << DtorAttrs->getName();
1017 DtorAttrs = DtorAttrs->getNext();
1021 // In delayed template parsing mode, for function template we consume the
1022 // tokens and store them for late parsing at the end of the translation unit.
1023 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1024 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1025 Actions.canDelayFunctionBody(D)) {
1026 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1028 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1029 Scope *ParentScope = getCurScope()->getParent();
1031 D.setFunctionDefinitionKind(FDK_Definition);
1032 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1033 TemplateParameterLists);
1035 D.getMutableDeclSpec().abort();
1038 LexTemplateFunctionForLateParsing(Toks);
1041 FunctionDecl *FnD = DP->getAsFunction();
1042 Actions.CheckForFunctionRedefinition(FnD);
1043 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1047 else if (CurParsedObjCImpl &&
1048 !TemplateInfo.TemplateParams &&
1049 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1050 Tok.is(tok::colon)) &&
1051 Actions.CurContext->isTranslationUnit()) {
1052 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1053 Scope *ParentScope = getCurScope()->getParent();
1055 D.setFunctionDefinitionKind(FDK_Definition);
1056 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1057 MultiTemplateParamsArg());
1058 D.complete(FuncDecl);
1059 D.getMutableDeclSpec().abort();
1061 // Consume the tokens and store them for later parsing.
1062 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1063 CurParsedObjCImpl->HasCFunction = true;
1066 // FIXME: Should we really fall through here?
1069 // Enter a scope for the function body.
1070 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1072 // Tell the actions module that we have entered a function definition with the
1073 // specified Declarator for the function.
1074 Sema::SkipBodyInfo SkipBody;
1075 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1076 TemplateInfo.TemplateParams
1077 ? *TemplateInfo.TemplateParams
1078 : MultiTemplateParamsArg(),
1081 if (SkipBody.ShouldSkip) {
1086 // Break out of the ParsingDeclarator context before we parse the body.
1089 // Break out of the ParsingDeclSpec context, too. This const_cast is
1090 // safe because we're always the sole owner.
1091 D.getMutableDeclSpec().abort();
1093 if (TryConsumeToken(tok::equal)) {
1094 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1096 bool Delete = false;
1097 SourceLocation KWLoc;
1098 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1099 Diag(KWLoc, getLangOpts().CPlusPlus11
1100 ? diag::warn_cxx98_compat_defaulted_deleted_function
1101 : diag::ext_defaulted_deleted_function)
1103 Actions.SetDeclDeleted(Res, KWLoc);
1105 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1106 Diag(KWLoc, getLangOpts().CPlusPlus11
1107 ? diag::warn_cxx98_compat_defaulted_deleted_function
1108 : diag::ext_defaulted_deleted_function)
1109 << 0 /* defaulted */;
1110 Actions.SetDeclDefaulted(Res, KWLoc);
1112 llvm_unreachable("function definition after = not 'delete' or 'default'");
1115 if (Tok.is(tok::comma)) {
1116 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1118 SkipUntil(tok::semi);
1119 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1120 Delete ? "delete" : "default")) {
1121 SkipUntil(tok::semi);
1124 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1125 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1129 if (Tok.is(tok::kw_try))
1130 return ParseFunctionTryBlock(Res, BodyScope);
1132 // If we have a colon, then we're probably parsing a C++
1133 // ctor-initializer.
1134 if (Tok.is(tok::colon)) {
1135 ParseConstructorInitializer(Res);
1137 // Recover from error.
1138 if (!Tok.is(tok::l_brace)) {
1140 Actions.ActOnFinishFunctionBody(Res, nullptr);
1144 Actions.ActOnDefaultCtorInitializers(Res);
1146 // Late attributes are parsed in the same scope as the function body.
1147 if (LateParsedAttrs)
1148 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1150 return ParseFunctionStatementBody(Res, BodyScope);
1153 void Parser::SkipFunctionBody() {
1154 if (Tok.is(tok::equal)) {
1155 SkipUntil(tok::semi);
1159 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1160 if (IsFunctionTryBlock)
1163 CachedTokens Skipped;
1164 if (ConsumeAndStoreFunctionPrologue(Skipped))
1165 SkipMalformedDecl();
1167 SkipUntil(tok::r_brace);
1168 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1169 SkipUntil(tok::l_brace);
1170 SkipUntil(tok::r_brace);
1175 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1176 /// types for a function with a K&R-style identifier list for arguments.
1177 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1178 // We know that the top-level of this declarator is a function.
1179 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1181 // Enter function-declaration scope, limiting any declarators to the
1182 // function prototype scope, including parameter declarators.
1183 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1184 Scope::FunctionDeclarationScope | Scope::DeclScope);
1186 // Read all the argument declarations.
1187 while (isDeclarationSpecifier()) {
1188 SourceLocation DSStart = Tok.getLocation();
1190 // Parse the common declaration-specifiers piece.
1191 DeclSpec DS(AttrFactory);
1192 ParseDeclarationSpecifiers(DS);
1194 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1195 // least one declarator'.
1196 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1197 // the declarations though. It's trivial to ignore them, really hard to do
1198 // anything else with them.
1199 if (TryConsumeToken(tok::semi)) {
1200 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1204 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1206 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1207 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1208 Diag(DS.getStorageClassSpecLoc(),
1209 diag::err_invalid_storage_class_in_func_decl);
1210 DS.ClearStorageClassSpecs();
1212 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1213 Diag(DS.getThreadStorageClassSpecLoc(),
1214 diag::err_invalid_storage_class_in_func_decl);
1215 DS.ClearStorageClassSpecs();
1218 // Parse the first declarator attached to this declspec.
1219 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1220 ParseDeclarator(ParmDeclarator);
1222 // Handle the full declarator list.
1224 // If attributes are present, parse them.
1225 MaybeParseGNUAttributes(ParmDeclarator);
1227 // Ask the actions module to compute the type for this declarator.
1229 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1232 // A missing identifier has already been diagnosed.
1233 ParmDeclarator.getIdentifier()) {
1235 // Scan the argument list looking for the correct param to apply this
1237 for (unsigned i = 0; ; ++i) {
1238 // C99 6.9.1p6: those declarators shall declare only identifiers from
1239 // the identifier list.
1240 if (i == FTI.NumParams) {
1241 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1242 << ParmDeclarator.getIdentifier();
1246 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1247 // Reject redefinitions of parameters.
1248 if (FTI.Params[i].Param) {
1249 Diag(ParmDeclarator.getIdentifierLoc(),
1250 diag::err_param_redefinition)
1251 << ParmDeclarator.getIdentifier();
1253 FTI.Params[i].Param = Param;
1260 // If we don't have a comma, it is either the end of the list (a ';') or
1261 // an error, bail out.
1262 if (Tok.isNot(tok::comma))
1265 ParmDeclarator.clear();
1267 // Consume the comma.
1268 ParmDeclarator.setCommaLoc(ConsumeToken());
1270 // Parse the next declarator.
1271 ParseDeclarator(ParmDeclarator);
1274 // Consume ';' and continue parsing.
1275 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1278 // Otherwise recover by skipping to next semi or mandatory function body.
1279 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1281 TryConsumeToken(tok::semi);
1284 // The actions module must verify that all arguments were declared.
1285 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1289 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1290 /// allowed to be a wide string, and is not subject to character translation.
1292 /// [GNU] asm-string-literal:
1295 ExprResult Parser::ParseAsmStringLiteral() {
1296 if (!isTokenStringLiteral()) {
1297 Diag(Tok, diag::err_expected_string_literal)
1298 << /*Source='in...'*/0 << "'asm'";
1302 ExprResult AsmString(ParseStringLiteralExpression());
1303 if (!AsmString.isInvalid()) {
1304 const auto *SL = cast<StringLiteral>(AsmString.get());
1305 if (!SL->isAscii()) {
1306 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1308 << SL->getSourceRange();
1317 /// [GNU] simple-asm-expr:
1318 /// 'asm' '(' asm-string-literal ')'
1320 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1321 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1322 SourceLocation Loc = ConsumeToken();
1324 if (Tok.is(tok::kw_volatile)) {
1325 // Remove from the end of 'asm' to the end of 'volatile'.
1326 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1327 PP.getLocForEndOfToken(Tok.getLocation()));
1329 Diag(Tok, diag::warn_file_asm_volatile)
1330 << FixItHint::CreateRemoval(RemovalRange);
1334 BalancedDelimiterTracker T(*this, tok::l_paren);
1335 if (T.consumeOpen()) {
1336 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1340 ExprResult Result(ParseAsmStringLiteral());
1342 if (!Result.isInvalid()) {
1343 // Close the paren and get the location of the end bracket
1346 *EndLoc = T.getCloseLocation();
1347 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1349 *EndLoc = Tok.getLocation();
1356 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1357 /// cleanup pool so that it gets destroyed when parsing the current top level
1358 /// declaration is finished.
1359 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1360 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1361 TemplateIdAnnotation *
1362 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1366 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1367 // Push the current token back into the token stream (or revert it if it is
1368 // cached) and use an annotation scope token for current token.
1369 if (PP.isBacktrackEnabled())
1370 PP.RevertCachedTokens(1);
1373 Tok.setKind(tok::annot_cxxscope);
1374 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1375 Tok.setAnnotationRange(SS.getRange());
1377 // In case the tokens were cached, have Preprocessor replace them
1378 // with the annotation token. We don't need to do this if we've
1379 // just reverted back to a prior state.
1380 if (IsNewAnnotation)
1381 PP.AnnotateCachedTokens(Tok);
1384 /// \brief Attempt to classify the name at the current token position. This may
1385 /// form a type, scope or primary expression annotation, or replace the token
1386 /// with a typo-corrected keyword. This is only appropriate when the current
1387 /// name must refer to an entity which has already been declared.
1389 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1390 /// and might possibly have a dependent nested name specifier.
1391 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1392 /// no typo correction will be performed.
1393 Parser::AnnotatedNameKind
1394 Parser::TryAnnotateName(bool IsAddressOfOperand,
1395 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1396 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1398 const bool EnteringContext = false;
1399 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1402 if (getLangOpts().CPlusPlus &&
1403 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1406 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1407 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, false, SS,
1408 !WasScopeAnnotation))
1410 return ANK_Unresolved;
1413 IdentifierInfo *Name = Tok.getIdentifierInfo();
1414 SourceLocation NameLoc = Tok.getLocation();
1416 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1417 // typo-correct to tentatively-declared identifiers.
1418 if (isTentativelyDeclared(Name)) {
1419 // Identifier has been tentatively declared, and thus cannot be resolved as
1420 // an expression. Fall back to annotating it as a type.
1421 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, false, SS,
1422 !WasScopeAnnotation))
1424 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1427 Token Next = NextToken();
1429 // Look up and classify the identifier. We don't perform any typo-correction
1430 // after a scope specifier, because in general we can't recover from typos
1431 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1432 // jump back into scope specifier parsing).
1433 Sema::NameClassification Classification = Actions.ClassifyName(
1434 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1435 SS.isEmpty() ? std::move(CCC) : nullptr);
1437 switch (Classification.getKind()) {
1438 case Sema::NC_Error:
1441 case Sema::NC_Keyword:
1442 // The identifier was typo-corrected to a keyword.
1443 Tok.setIdentifierInfo(Name);
1444 Tok.setKind(Name->getTokenID());
1445 PP.TypoCorrectToken(Tok);
1446 if (SS.isNotEmpty())
1447 AnnotateScopeToken(SS, !WasScopeAnnotation);
1448 // We've "annotated" this as a keyword.
1451 case Sema::NC_Unknown:
1452 // It's not something we know about. Leave it unannotated.
1455 case Sema::NC_Type: {
1456 SourceLocation BeginLoc = NameLoc;
1457 if (SS.isNotEmpty())
1458 BeginLoc = SS.getBeginLoc();
1460 /// An Objective-C object type followed by '<' is a specialization of
1461 /// a parameterized class type or a protocol-qualified type.
1462 ParsedType Ty = Classification.getType();
1463 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1464 (Ty.get()->isObjCObjectType() ||
1465 Ty.get()->isObjCObjectPointerType())) {
1466 // Consume the name.
1467 SourceLocation IdentifierLoc = ConsumeToken();
1468 SourceLocation NewEndLoc;
1470 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1471 /*consumeLastToken=*/false,
1473 if (NewType.isUsable())
1477 Tok.setKind(tok::annot_typename);
1478 setTypeAnnotation(Tok, Ty);
1479 Tok.setAnnotationEndLoc(Tok.getLocation());
1480 Tok.setLocation(BeginLoc);
1481 PP.AnnotateCachedTokens(Tok);
1485 case Sema::NC_Expression:
1486 Tok.setKind(tok::annot_primary_expr);
1487 setExprAnnotation(Tok, Classification.getExpression());
1488 Tok.setAnnotationEndLoc(NameLoc);
1489 if (SS.isNotEmpty())
1490 Tok.setLocation(SS.getBeginLoc());
1491 PP.AnnotateCachedTokens(Tok);
1494 case Sema::NC_TypeTemplate:
1495 if (Next.isNot(tok::less)) {
1496 // This may be a type template being used as a template template argument.
1497 if (SS.isNotEmpty())
1498 AnnotateScopeToken(SS, !WasScopeAnnotation);
1499 return ANK_TemplateName;
1502 case Sema::NC_VarTemplate:
1503 case Sema::NC_FunctionTemplate: {
1504 // We have a type, variable or function template followed by '<'.
1507 Id.setIdentifier(Name, NameLoc);
1508 if (AnnotateTemplateIdToken(
1509 TemplateTy::make(Classification.getTemplateName()),
1510 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1515 case Sema::NC_NestedNameSpecifier:
1516 llvm_unreachable("already parsed nested name specifier");
1519 // Unable to classify the name, but maybe we can annotate a scope specifier.
1520 if (SS.isNotEmpty())
1521 AnnotateScopeToken(SS, !WasScopeAnnotation);
1522 return ANK_Unresolved;
1525 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1526 assert(Tok.isNot(tok::identifier));
1527 Diag(Tok, diag::ext_keyword_as_ident)
1528 << PP.getSpelling(Tok)
1531 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1532 Tok.setKind(tok::identifier);
1536 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1537 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1538 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1539 /// with a single annotation token representing the typename or C++ scope
1541 /// This simplifies handling of C++ scope specifiers and allows efficient
1542 /// backtracking without the need to re-parse and resolve nested-names and
1544 /// It will mainly be called when we expect to treat identifiers as typenames
1545 /// (if they are typenames). For example, in C we do not expect identifiers
1546 /// inside expressions to be treated as typenames so it will not be called
1547 /// for expressions in C.
1548 /// The benefit for C/ObjC is that a typename will be annotated and
1549 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1550 /// will not be called twice, once to check whether we have a declaration
1551 /// specifier, and another one to get the actual type inside
1552 /// ParseDeclarationSpecifiers).
1554 /// This returns true if an error occurred.
1556 /// Note that this routine emits an error if you call it with ::new or ::delete
1557 /// as the current tokens, so only call it in contexts where these are invalid.
1558 bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext, bool NeedType) {
1559 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1560 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1561 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1562 Tok.is(tok::kw___super)) &&
1563 "Cannot be a type or scope token!");
1565 if (Tok.is(tok::kw_typename)) {
1566 // MSVC lets you do stuff like:
1567 // typename typedef T_::D D;
1569 // We will consume the typedef token here and put it back after we have
1570 // parsed the first identifier, transforming it into something more like:
1571 // typename T_::D typedef D;
1572 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1574 PP.Lex(TypedefToken);
1575 bool Result = TryAnnotateTypeOrScopeToken(EnteringContext, NeedType);
1579 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1583 // Parse a C++ typename-specifier, e.g., "typename T::type".
1585 // typename-specifier:
1586 // 'typename' '::' [opt] nested-name-specifier identifier
1587 // 'typename' '::' [opt] nested-name-specifier template [opt]
1588 // simple-template-id
1589 SourceLocation TypenameLoc = ConsumeToken();
1591 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/ParsedType(),
1592 /*EnteringContext=*/false,
1593 nullptr, /*IsTypename*/ true))
1596 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1597 Tok.is(tok::annot_decltype)) {
1598 // Attempt to recover by skipping the invalid 'typename'
1599 if (Tok.is(tok::annot_decltype) ||
1600 (!TryAnnotateTypeOrScopeToken(EnteringContext, NeedType) &&
1601 Tok.isAnnotation())) {
1602 unsigned DiagID = diag::err_expected_qualified_after_typename;
1603 // MS compatibility: MSVC permits using known types with typename.
1604 // e.g. "typedef typename T* pointer_type"
1605 if (getLangOpts().MicrosoftExt)
1606 DiagID = diag::warn_expected_qualified_after_typename;
1607 Diag(Tok.getLocation(), DiagID);
1612 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1617 if (Tok.is(tok::identifier)) {
1618 // FIXME: check whether the next token is '<', first!
1619 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1620 *Tok.getIdentifierInfo(),
1622 } else if (Tok.is(tok::annot_template_id)) {
1623 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1624 if (TemplateId->Kind != TNK_Type_template &&
1625 TemplateId->Kind != TNK_Dependent_template_name) {
1626 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1627 << Tok.getAnnotationRange();
1631 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1632 TemplateId->NumArgs);
1634 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1635 TemplateId->TemplateKWLoc,
1636 TemplateId->Template,
1637 TemplateId->TemplateNameLoc,
1638 TemplateId->LAngleLoc,
1640 TemplateId->RAngleLoc);
1642 Diag(Tok, diag::err_expected_type_name_after_typename)
1647 SourceLocation EndLoc = Tok.getLastLoc();
1648 Tok.setKind(tok::annot_typename);
1649 setTypeAnnotation(Tok, Ty.isInvalid() ? ParsedType() : Ty.get());
1650 Tok.setAnnotationEndLoc(EndLoc);
1651 Tok.setLocation(TypenameLoc);
1652 PP.AnnotateCachedTokens(Tok);
1656 // Remembers whether the token was originally a scope annotation.
1657 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1660 if (getLangOpts().CPlusPlus)
1661 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1664 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, NeedType,
1665 SS, !WasScopeAnnotation);
1668 /// \brief Try to annotate a type or scope token, having already parsed an
1669 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1670 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1671 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(bool EnteringContext,
1675 if (Tok.is(tok::identifier)) {
1676 IdentifierInfo *CorrectedII = nullptr;
1677 // Determine whether the identifier is a type name.
1678 if (ParsedType Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
1679 Tok.getLocation(), getCurScope(),
1681 NextToken().is(tok::period),
1683 /*IsCtorOrDtorName=*/false,
1684 /*NonTrivialTypeSourceInfo*/ true,
1685 NeedType ? &CorrectedII
1687 // A FixIt was applied as a result of typo correction
1689 Tok.setIdentifierInfo(CorrectedII);
1691 SourceLocation BeginLoc = Tok.getLocation();
1692 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1693 BeginLoc = SS.getBeginLoc();
1695 /// An Objective-C object type followed by '<' is a specialization of
1696 /// a parameterized class type or a protocol-qualified type.
1697 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1698 (Ty.get()->isObjCObjectType() ||
1699 Ty.get()->isObjCObjectPointerType())) {
1700 // Consume the name.
1701 SourceLocation IdentifierLoc = ConsumeToken();
1702 SourceLocation NewEndLoc;
1704 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1705 /*consumeLastToken=*/false,
1707 if (NewType.isUsable())
1711 // This is a typename. Replace the current token in-place with an
1712 // annotation type token.
1713 Tok.setKind(tok::annot_typename);
1714 setTypeAnnotation(Tok, Ty);
1715 Tok.setAnnotationEndLoc(Tok.getLocation());
1716 Tok.setLocation(BeginLoc);
1718 // In case the tokens were cached, have Preprocessor replace
1719 // them with the annotation token.
1720 PP.AnnotateCachedTokens(Tok);
1724 if (!getLangOpts().CPlusPlus) {
1725 // If we're in C, we can't have :: tokens at all (the lexer won't return
1726 // them). If the identifier is not a type, then it can't be scope either,
1731 // If this is a template-id, annotate with a template-id or type token.
1732 if (NextToken().is(tok::less)) {
1733 TemplateTy Template;
1734 UnqualifiedId TemplateName;
1735 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1736 bool MemberOfUnknownSpecialization;
1737 if (TemplateNameKind TNK
1738 = Actions.isTemplateName(getCurScope(), SS,
1739 /*hasTemplateKeyword=*/false, TemplateName,
1740 /*ObjectType=*/ ParsedType(),
1742 Template, MemberOfUnknownSpecialization)) {
1743 // Consume the identifier.
1745 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1747 // If an unrecoverable error occurred, we need to return true here,
1748 // because the token stream is in a damaged state. We may not return
1749 // a valid identifier.
1755 // The current token, which is either an identifier or a
1756 // template-id, is not part of the annotation. Fall through to
1757 // push that token back into the stream and complete the C++ scope
1758 // specifier annotation.
1761 if (Tok.is(tok::annot_template_id)) {
1762 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1763 if (TemplateId->Kind == TNK_Type_template) {
1764 // A template-id that refers to a type was parsed into a
1765 // template-id annotation in a context where we weren't allowed
1766 // to produce a type annotation token. Update the template-id
1767 // annotation token to a type annotation token now.
1768 AnnotateTemplateIdTokenAsType();
1776 // A C++ scope specifier that isn't followed by a typename.
1777 AnnotateScopeToken(SS, IsNewScope);
1781 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1782 /// annotates C++ scope specifiers and template-ids. This returns
1783 /// true if there was an error that could not be recovered from.
1785 /// Note that this routine emits an error if you call it with ::new or ::delete
1786 /// as the current tokens, so only call it in contexts where these are invalid.
1787 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1788 assert(getLangOpts().CPlusPlus &&
1789 "Call sites of this function should be guarded by checking for C++");
1790 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1791 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1792 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1793 "Cannot be a type or scope token!");
1796 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1801 AnnotateScopeToken(SS, true);
1805 bool Parser::isTokenEqualOrEqualTypo() {
1806 tok::TokenKind Kind = Tok.getKind();
1810 case tok::ampequal: // &=
1811 case tok::starequal: // *=
1812 case tok::plusequal: // +=
1813 case tok::minusequal: // -=
1814 case tok::exclaimequal: // !=
1815 case tok::slashequal: // /=
1816 case tok::percentequal: // %=
1817 case tok::lessequal: // <=
1818 case tok::lesslessequal: // <<=
1819 case tok::greaterequal: // >=
1820 case tok::greatergreaterequal: // >>=
1821 case tok::caretequal: // ^=
1822 case tok::pipeequal: // |=
1823 case tok::equalequal: // ==
1824 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1826 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1832 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1833 assert(Tok.is(tok::code_completion));
1834 PrevTokLocation = Tok.getLocation();
1836 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1837 if (S->getFlags() & Scope::FnScope) {
1838 Actions.CodeCompleteOrdinaryName(getCurScope(),
1839 Sema::PCC_RecoveryInFunction);
1841 return PrevTokLocation;
1844 if (S->getFlags() & Scope::ClassScope) {
1845 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1847 return PrevTokLocation;
1851 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1853 return PrevTokLocation;
1856 // Code-completion pass-through functions
1858 void Parser::CodeCompleteDirective(bool InConditional) {
1859 Actions.CodeCompletePreprocessorDirective(InConditional);
1862 void Parser::CodeCompleteInConditionalExclusion() {
1863 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1866 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1867 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1870 void Parser::CodeCompletePreprocessorExpression() {
1871 Actions.CodeCompletePreprocessorExpression();
1874 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1875 MacroInfo *MacroInfo,
1876 unsigned ArgumentIndex) {
1877 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1881 void Parser::CodeCompleteNaturalLanguage() {
1882 Actions.CodeCompleteNaturalLanguage();
1885 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1886 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1887 "Expected '__if_exists' or '__if_not_exists'");
1888 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1889 Result.KeywordLoc = ConsumeToken();
1891 BalancedDelimiterTracker T(*this, tok::l_paren);
1892 if (T.consumeOpen()) {
1893 Diag(Tok, diag::err_expected_lparen_after)
1894 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1898 // Parse nested-name-specifier.
1899 if (getLangOpts().CPlusPlus)
1900 ParseOptionalCXXScopeSpecifier(Result.SS, ParsedType(),
1901 /*EnteringContext=*/false);
1903 // Check nested-name specifier.
1904 if (Result.SS.isInvalid()) {
1909 // Parse the unqualified-id.
1910 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1911 if (ParseUnqualifiedId(Result.SS, false, true, true, ParsedType(),
1912 TemplateKWLoc, Result.Name)) {
1917 if (T.consumeClose())
1920 // Check if the symbol exists.
1921 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1922 Result.IsIfExists, Result.SS,
1924 case Sema::IER_Exists:
1925 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1928 case Sema::IER_DoesNotExist:
1929 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
1932 case Sema::IER_Dependent:
1933 Result.Behavior = IEB_Dependent;
1936 case Sema::IER_Error:
1943 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
1944 IfExistsCondition Result;
1945 if (ParseMicrosoftIfExistsCondition(Result))
1948 BalancedDelimiterTracker Braces(*this, tok::l_brace);
1949 if (Braces.consumeOpen()) {
1950 Diag(Tok, diag::err_expected) << tok::l_brace;
1954 switch (Result.Behavior) {
1956 // Parse declarations below.
1960 llvm_unreachable("Cannot have a dependent external declaration");
1967 // Parse the declarations.
1968 // FIXME: Support module import within __if_exists?
1969 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
1970 ParsedAttributesWithRange attrs(AttrFactory);
1971 MaybeParseCXX11Attributes(attrs);
1972 MaybeParseMicrosoftAttributes(attrs);
1973 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
1974 if (Result && !getCurScope()->getParent())
1975 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
1977 Braces.consumeClose();
1980 Parser::DeclGroupPtrTy Parser::ParseModuleImport(SourceLocation AtLoc) {
1981 assert(Tok.isObjCAtKeyword(tok::objc_import) &&
1982 "Improper start to module import");
1983 SourceLocation ImportLoc = ConsumeToken();
1985 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1987 // Parse the module path.
1989 if (!Tok.is(tok::identifier)) {
1990 if (Tok.is(tok::code_completion)) {
1991 Actions.CodeCompleteModuleImport(ImportLoc, Path);
1993 return DeclGroupPtrTy();
1996 Diag(Tok, diag::err_module_expected_ident);
1997 SkipUntil(tok::semi);
1998 return DeclGroupPtrTy();
2001 // Record this part of the module path.
2002 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2005 if (Tok.is(tok::period)) {
2013 if (PP.hadModuleLoaderFatalFailure()) {
2014 // With a fatal failure in the module loader, we abort parsing.
2016 return DeclGroupPtrTy();
2019 DeclResult Import = Actions.ActOnModuleImport(AtLoc, ImportLoc, Path);
2020 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2021 if (Import.isInvalid())
2022 return DeclGroupPtrTy();
2024 return Actions.ConvertDeclToDeclGroup(Import.get());
2027 /// \brief Try recover parser when module annotation appears where it must not
2029 /// \returns false if the recover was successful and parsing may be continued, or
2030 /// true if parser must bail out to top level and handle the token there.
2031 bool Parser::parseMisplacedModuleImport() {
2033 switch (Tok.getKind()) {
2034 case tok::annot_module_end:
2035 // Inform caller that recovery failed, the error must be handled at upper
2038 case tok::annot_module_begin:
2039 Actions.diagnoseMisplacedModuleImport(reinterpret_cast<Module *>(
2040 Tok.getAnnotationValue()), Tok.getLocation());
2042 case tok::annot_module_include:
2043 // Module import found where it should not be, for instance, inside a
2044 // namespace. Recover by importing the module.
2045 Actions.ActOnModuleInclude(Tok.getLocation(),
2046 reinterpret_cast<Module *>(
2047 Tok.getAnnotationValue()));
2049 // If there is another module import, process it.
2058 bool BalancedDelimiterTracker::diagnoseOverflow() {
2059 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2060 << P.getLangOpts().BracketDepth;
2061 P.Diag(P.Tok, diag::note_bracket_depth);
2066 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2068 tok::TokenKind SkipToTok) {
2069 LOpen = P.Tok.getLocation();
2070 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2071 if (SkipToTok != tok::unknown)
2072 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2076 if (getDepth() < MaxDepth)
2079 return diagnoseOverflow();
2082 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2083 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2085 if (P.Tok.is(tok::annot_module_end))
2086 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2088 P.Diag(P.Tok, diag::err_expected) << Close;
2089 P.Diag(LOpen, diag::note_matching) << Kind;
2091 // If we're not already at some kind of closing bracket, skip to our closing
2093 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2094 P.Tok.isNot(tok::r_square) &&
2095 P.SkipUntil(Close, FinalToken,
2096 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2098 LClose = P.ConsumeAnyToken();
2102 void BalancedDelimiterTracker::skipToEnd() {
2103 P.SkipUntil(Close, Parser::StopBeforeMatch);