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;
494 Ident_strict = nullptr;
495 Ident_replacement = nullptr;
497 Ident__except = nullptr;
499 Ident__exception_code = Ident__exception_info = nullptr;
500 Ident__abnormal_termination = Ident___exception_code = nullptr;
501 Ident___exception_info = Ident___abnormal_termination = nullptr;
502 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
503 Ident_AbnormalTermination = nullptr;
505 if(getLangOpts().Borland) {
506 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
507 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
508 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
509 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
510 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
511 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
512 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
513 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
514 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
516 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
517 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
518 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
519 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
520 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
521 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
522 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
523 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
524 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
527 Actions.Initialize();
529 // Prime the lexer look-ahead.
533 void Parser::LateTemplateParserCleanupCallback(void *P) {
534 // While this RAII helper doesn't bracket any actual work, the destructor will
535 // clean up annotations that were created during ActOnEndOfTranslationUnit
536 // when incremental processing is enabled.
537 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
540 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
541 /// action tells us to. This returns true if the EOF was encountered.
542 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
543 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
545 // Skip over the EOF token, flagging end of previous input for incremental
547 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
551 switch (Tok.getKind()) {
552 case tok::annot_pragma_unused:
553 HandlePragmaUnused();
556 case tok::annot_module_include:
557 Actions.ActOnModuleInclude(Tok.getLocation(),
558 reinterpret_cast<Module *>(
559 Tok.getAnnotationValue()));
563 case tok::annot_module_begin:
564 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
565 Tok.getAnnotationValue()));
569 case tok::annot_module_end:
570 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
571 Tok.getAnnotationValue()));
576 // Late template parsing can begin.
577 if (getLangOpts().DelayedTemplateParsing)
578 Actions.SetLateTemplateParser(LateTemplateParserCallback,
579 PP.isIncrementalProcessingEnabled() ?
580 LateTemplateParserCleanupCallback : nullptr,
582 if (!PP.isIncrementalProcessingEnabled())
583 Actions.ActOnEndOfTranslationUnit();
584 //else don't tell Sema that we ended parsing: more input might come.
591 ParsedAttributesWithRange attrs(AttrFactory);
592 MaybeParseCXX11Attributes(attrs);
593 MaybeParseMicrosoftAttributes(attrs);
595 Result = ParseExternalDeclaration(attrs);
599 /// ParseExternalDeclaration:
601 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
602 /// function-definition
604 /// [GNU] asm-definition
605 /// [GNU] __extension__ external-declaration
606 /// [OBJC] objc-class-definition
607 /// [OBJC] objc-class-declaration
608 /// [OBJC] objc-alias-declaration
609 /// [OBJC] objc-protocol-definition
610 /// [OBJC] objc-method-definition
612 /// [C++] linkage-specification
613 /// [GNU] asm-definition:
614 /// simple-asm-expr ';'
615 /// [C++11] empty-declaration
616 /// [C++11] attribute-declaration
618 /// [C++11] empty-declaration:
621 /// [C++0x/GNU] 'extern' 'template' declaration
622 Parser::DeclGroupPtrTy
623 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
624 ParsingDeclSpec *DS) {
625 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
626 ParenBraceBracketBalancer BalancerRAIIObj(*this);
628 if (PP.isCodeCompletionReached()) {
633 Decl *SingleDecl = nullptr;
634 switch (Tok.getKind()) {
635 case tok::annot_pragma_vis:
636 HandlePragmaVisibility();
638 case tok::annot_pragma_pack:
641 case tok::annot_pragma_msstruct:
642 HandlePragmaMSStruct();
644 case tok::annot_pragma_align:
647 case tok::annot_pragma_weak:
650 case tok::annot_pragma_weakalias:
651 HandlePragmaWeakAlias();
653 case tok::annot_pragma_redefine_extname:
654 HandlePragmaRedefineExtname();
656 case tok::annot_pragma_fp_contract:
657 HandlePragmaFPContract();
659 case tok::annot_pragma_opencl_extension:
660 HandlePragmaOpenCLExtension();
662 case tok::annot_pragma_openmp: {
663 AccessSpecifier AS = AS_none;
664 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
666 case tok::annot_pragma_ms_pointers_to_members:
667 HandlePragmaMSPointersToMembers();
669 case tok::annot_pragma_ms_vtordisp:
670 HandlePragmaMSVtorDisp();
672 case tok::annot_pragma_ms_pragma:
673 HandlePragmaMSPragma();
675 case tok::annot_pragma_dump:
679 // Either a C++11 empty-declaration or attribute-declaration.
680 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
683 ConsumeExtraSemi(OutsideFunction);
686 Diag(Tok, diag::err_extraneous_closing_brace);
690 Diag(Tok, diag::err_expected_external_declaration);
692 case tok::kw___extension__: {
693 // __extension__ silences extension warnings in the subexpression.
694 ExtensionRAIIObject O(Diags); // Use RAII to do this.
696 return ParseExternalDeclaration(attrs);
699 ProhibitAttributes(attrs);
701 SourceLocation StartLoc = Tok.getLocation();
702 SourceLocation EndLoc;
704 ExprResult Result(ParseSimpleAsm(&EndLoc));
706 // Check if GNU-style InlineAsm is disabled.
707 // Empty asm string is allowed because it will not introduce
708 // any assembly code.
709 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
710 const auto *SL = cast<StringLiteral>(Result.get());
711 if (!SL->getString().trim().empty())
712 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
715 ExpectAndConsume(tok::semi, diag::err_expected_after,
716 "top-level asm block");
718 if (Result.isInvalid())
720 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
724 return ParseObjCAtDirectives();
727 if (!getLangOpts().ObjC1) {
728 Diag(Tok, diag::err_expected_external_declaration);
732 SingleDecl = ParseObjCMethodDefinition();
734 case tok::code_completion:
735 Actions.CodeCompleteOrdinaryName(getCurScope(),
736 CurParsedObjCImpl? Sema::PCC_ObjCImplementation
737 : Sema::PCC_Namespace);
741 case tok::kw_namespace:
742 case tok::kw_typedef:
743 case tok::kw_template:
744 case tok::kw_export: // As in 'export template'
745 case tok::kw_static_assert:
746 case tok::kw__Static_assert:
747 // A function definition cannot start with any of these keywords.
749 SourceLocation DeclEnd;
750 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
754 // Parse (then ignore) 'static' prior to a template instantiation. This is
755 // a GCC extension that we intentionally do not support.
756 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
757 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
759 SourceLocation DeclEnd;
760 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
765 if (getLangOpts().CPlusPlus) {
766 tok::TokenKind NextKind = NextToken().getKind();
768 // Inline namespaces. Allowed as an extension even in C++03.
769 if (NextKind == tok::kw_namespace) {
770 SourceLocation DeclEnd;
771 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
774 // Parse (then ignore) 'inline' prior to a template instantiation. This is
775 // a GCC extension that we intentionally do not support.
776 if (NextKind == tok::kw_template) {
777 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
779 SourceLocation DeclEnd;
780 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
786 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
788 SourceLocation ExternLoc = ConsumeToken();
789 SourceLocation TemplateLoc = ConsumeToken();
790 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
791 diag::warn_cxx98_compat_extern_template :
792 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
793 SourceLocation DeclEnd;
794 return Actions.ConvertDeclToDeclGroup(
795 ParseExplicitInstantiation(Declarator::FileContext,
796 ExternLoc, TemplateLoc, DeclEnd));
800 case tok::kw___if_exists:
801 case tok::kw___if_not_exists:
802 ParseMicrosoftIfExistsExternalDeclaration();
807 // We can't tell whether this is a function-definition or declaration yet.
808 return ParseDeclarationOrFunctionDefinition(attrs, DS);
811 // This routine returns a DeclGroup, if the thing we parsed only contains a
812 // single decl, convert it now.
813 return Actions.ConvertDeclToDeclGroup(SingleDecl);
816 /// \brief Determine whether the current token, if it occurs after a
817 /// declarator, continues a declaration or declaration list.
818 bool Parser::isDeclarationAfterDeclarator() {
819 // Check for '= delete' or '= default'
820 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
821 const Token &KW = NextToken();
822 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
826 return Tok.is(tok::equal) || // int X()= -> not a function def
827 Tok.is(tok::comma) || // int X(), -> not a function def
828 Tok.is(tok::semi) || // int X(); -> not a function def
829 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
830 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
831 (getLangOpts().CPlusPlus &&
832 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
835 /// \brief Determine whether the current token, if it occurs after a
836 /// declarator, indicates the start of a function definition.
837 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
838 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
839 if (Tok.is(tok::l_brace)) // int X() {}
842 // Handle K&R C argument lists: int X(f) int f; {}
843 if (!getLangOpts().CPlusPlus &&
844 Declarator.getFunctionTypeInfo().isKNRPrototype())
845 return isDeclarationSpecifier();
847 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
848 const Token &KW = NextToken();
849 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
852 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
853 Tok.is(tok::kw_try); // X() try { ... }
856 /// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or
857 /// a declaration. We can't tell which we have until we read up to the
858 /// compound-statement in function-definition. TemplateParams, if
859 /// non-NULL, provides the template parameters when we're parsing a
860 /// C++ template-declaration.
862 /// function-definition: [C99 6.9.1]
863 /// decl-specs declarator declaration-list[opt] compound-statement
864 /// [C90] function-definition: [C99 6.7.1] - implicit int result
865 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
867 /// declaration: [C99 6.7]
868 /// declaration-specifiers init-declarator-list[opt] ';'
869 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
870 /// [OMP] threadprivate-directive [TODO]
872 Parser::DeclGroupPtrTy
873 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
875 AccessSpecifier AS) {
876 // Parse the common declaration-specifiers piece.
877 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
879 // If we had a free-standing type definition with a missing semicolon, we
880 // may get this far before the problem becomes obvious.
881 if (DS.hasTagDefinition() &&
882 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
885 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
886 // declaration-specifiers init-declarator-list[opt] ';'
887 if (Tok.is(tok::semi)) {
888 ProhibitAttributes(attrs);
890 RecordDecl *AnonRecord = nullptr;
891 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
893 DS.complete(TheDecl);
895 Decl* decls[] = {AnonRecord, TheDecl};
896 return Actions.BuildDeclaratorGroup(decls, /*TypeMayContainAuto=*/false);
898 return Actions.ConvertDeclToDeclGroup(TheDecl);
901 DS.takeAttributesFrom(attrs);
903 // ObjC2 allows prefix attributes on class interfaces and protocols.
904 // FIXME: This still needs better diagnostics. We should only accept
905 // attributes here, no types, etc.
906 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
907 SourceLocation AtLoc = ConsumeToken(); // the "@"
908 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
909 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
910 Diag(Tok, diag::err_objc_unexpected_attr);
911 SkipUntil(tok::semi); // FIXME: better skip?
917 const char *PrevSpec = nullptr;
919 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
920 Actions.getASTContext().getPrintingPolicy()))
921 Diag(AtLoc, DiagID) << PrevSpec;
923 if (Tok.isObjCAtKeyword(tok::objc_protocol))
924 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
926 return Actions.ConvertDeclToDeclGroup(
927 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
930 // If the declspec consisted only of 'extern' and we have a string
931 // literal following it, this must be a C++ linkage specifier like
933 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
934 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
935 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
936 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
937 return Actions.ConvertDeclToDeclGroup(TheDecl);
940 return ParseDeclGroup(DS, Declarator::FileContext);
943 Parser::DeclGroupPtrTy
944 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
946 AccessSpecifier AS) {
948 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
950 ParsingDeclSpec PDS(*this);
951 // Must temporarily exit the objective-c container scope for
952 // parsing c constructs and re-enter objc container scope
954 ObjCDeclContextSwitch ObjCDC(*this);
956 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
960 /// ParseFunctionDefinition - We parsed and verified that the specified
961 /// Declarator is well formed. If this is a K&R-style function, read the
962 /// parameters declaration-list, then start the compound-statement.
964 /// function-definition: [C99 6.9.1]
965 /// decl-specs declarator declaration-list[opt] compound-statement
966 /// [C90] function-definition: [C99 6.7.1] - implicit int result
967 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
968 /// [C++] function-definition: [C++ 8.4]
969 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
971 /// [C++] function-definition: [C++ 8.4]
972 /// decl-specifier-seq[opt] declarator function-try-block
974 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
975 const ParsedTemplateInfo &TemplateInfo,
976 LateParsedAttrList *LateParsedAttrs) {
977 // Poison SEH identifiers so they are flagged as illegal in function bodies.
978 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
979 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
981 // If this is C90 and the declspecs were completely missing, fudge in an
982 // implicit int. We do this here because this is the only place where
983 // declaration-specifiers are completely optional in the grammar.
984 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
985 const char *PrevSpec;
987 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
988 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
989 D.getIdentifierLoc(),
992 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
995 // If this declaration was formed with a K&R-style identifier list for the
996 // arguments, parse declarations for all of the args next.
997 // int foo(a,b) int a; float b; {}
998 if (FTI.isKNRPrototype())
999 ParseKNRParamDeclarations(D);
1001 // We should have either an opening brace or, in a C++ constructor,
1002 // we may have a colon.
1003 if (Tok.isNot(tok::l_brace) &&
1004 (!getLangOpts().CPlusPlus ||
1005 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1006 Tok.isNot(tok::equal)))) {
1007 Diag(Tok, diag::err_expected_fn_body);
1009 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1010 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1012 // If we didn't find the '{', bail out.
1013 if (Tok.isNot(tok::l_brace))
1017 // Check to make sure that any normal attributes are allowed to be on
1018 // a definition. Late parsed attributes are checked at the end.
1019 if (Tok.isNot(tok::equal)) {
1020 AttributeList *DtorAttrs = D.getAttributes();
1022 if (DtorAttrs->isKnownToGCC() &&
1023 !DtorAttrs->isCXX11Attribute()) {
1024 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1025 << DtorAttrs->getName();
1027 DtorAttrs = DtorAttrs->getNext();
1031 // In delayed template parsing mode, for function template we consume the
1032 // tokens and store them for late parsing at the end of the translation unit.
1033 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1034 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1035 Actions.canDelayFunctionBody(D)) {
1036 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1038 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1039 Scope *ParentScope = getCurScope()->getParent();
1041 D.setFunctionDefinitionKind(FDK_Definition);
1042 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1043 TemplateParameterLists);
1045 D.getMutableDeclSpec().abort();
1047 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1048 trySkippingFunctionBody()) {
1050 return Actions.ActOnSkippedFunctionBody(DP);
1054 LexTemplateFunctionForLateParsing(Toks);
1057 FunctionDecl *FnD = DP->getAsFunction();
1058 Actions.CheckForFunctionRedefinition(FnD);
1059 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1063 else if (CurParsedObjCImpl &&
1064 !TemplateInfo.TemplateParams &&
1065 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1066 Tok.is(tok::colon)) &&
1067 Actions.CurContext->isTranslationUnit()) {
1068 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1069 Scope *ParentScope = getCurScope()->getParent();
1071 D.setFunctionDefinitionKind(FDK_Definition);
1072 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1073 MultiTemplateParamsArg());
1074 D.complete(FuncDecl);
1075 D.getMutableDeclSpec().abort();
1077 // Consume the tokens and store them for later parsing.
1078 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1079 CurParsedObjCImpl->HasCFunction = true;
1082 // FIXME: Should we really fall through here?
1085 // Enter a scope for the function body.
1086 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1088 // Tell the actions module that we have entered a function definition with the
1089 // specified Declarator for the function.
1090 Sema::SkipBodyInfo SkipBody;
1091 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1092 TemplateInfo.TemplateParams
1093 ? *TemplateInfo.TemplateParams
1094 : MultiTemplateParamsArg(),
1097 if (SkipBody.ShouldSkip) {
1102 // Break out of the ParsingDeclarator context before we parse the body.
1105 // Break out of the ParsingDeclSpec context, too. This const_cast is
1106 // safe because we're always the sole owner.
1107 D.getMutableDeclSpec().abort();
1109 if (TryConsumeToken(tok::equal)) {
1110 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1112 bool Delete = false;
1113 SourceLocation KWLoc;
1114 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1115 Diag(KWLoc, getLangOpts().CPlusPlus11
1116 ? diag::warn_cxx98_compat_defaulted_deleted_function
1117 : diag::ext_defaulted_deleted_function)
1119 Actions.SetDeclDeleted(Res, KWLoc);
1121 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1122 Diag(KWLoc, getLangOpts().CPlusPlus11
1123 ? diag::warn_cxx98_compat_defaulted_deleted_function
1124 : diag::ext_defaulted_deleted_function)
1125 << 0 /* defaulted */;
1126 Actions.SetDeclDefaulted(Res, KWLoc);
1128 llvm_unreachable("function definition after = not 'delete' or 'default'");
1131 if (Tok.is(tok::comma)) {
1132 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1134 SkipUntil(tok::semi);
1135 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1136 Delete ? "delete" : "default")) {
1137 SkipUntil(tok::semi);
1140 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1141 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1145 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1146 trySkippingFunctionBody()) {
1148 Actions.ActOnSkippedFunctionBody(Res);
1149 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1152 if (Tok.is(tok::kw_try))
1153 return ParseFunctionTryBlock(Res, BodyScope);
1155 // If we have a colon, then we're probably parsing a C++
1156 // ctor-initializer.
1157 if (Tok.is(tok::colon)) {
1158 ParseConstructorInitializer(Res);
1160 // Recover from error.
1161 if (!Tok.is(tok::l_brace)) {
1163 Actions.ActOnFinishFunctionBody(Res, nullptr);
1167 Actions.ActOnDefaultCtorInitializers(Res);
1169 // Late attributes are parsed in the same scope as the function body.
1170 if (LateParsedAttrs)
1171 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1173 return ParseFunctionStatementBody(Res, BodyScope);
1176 void Parser::SkipFunctionBody() {
1177 if (Tok.is(tok::equal)) {
1178 SkipUntil(tok::semi);
1182 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1183 if (IsFunctionTryBlock)
1186 CachedTokens Skipped;
1187 if (ConsumeAndStoreFunctionPrologue(Skipped))
1188 SkipMalformedDecl();
1190 SkipUntil(tok::r_brace);
1191 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1192 SkipUntil(tok::l_brace);
1193 SkipUntil(tok::r_brace);
1198 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1199 /// types for a function with a K&R-style identifier list for arguments.
1200 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1201 // We know that the top-level of this declarator is a function.
1202 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1204 // Enter function-declaration scope, limiting any declarators to the
1205 // function prototype scope, including parameter declarators.
1206 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1207 Scope::FunctionDeclarationScope | Scope::DeclScope);
1209 // Read all the argument declarations.
1210 while (isDeclarationSpecifier()) {
1211 SourceLocation DSStart = Tok.getLocation();
1213 // Parse the common declaration-specifiers piece.
1214 DeclSpec DS(AttrFactory);
1215 ParseDeclarationSpecifiers(DS);
1217 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1218 // least one declarator'.
1219 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1220 // the declarations though. It's trivial to ignore them, really hard to do
1221 // anything else with them.
1222 if (TryConsumeToken(tok::semi)) {
1223 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1227 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1229 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1230 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1231 Diag(DS.getStorageClassSpecLoc(),
1232 diag::err_invalid_storage_class_in_func_decl);
1233 DS.ClearStorageClassSpecs();
1235 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1236 Diag(DS.getThreadStorageClassSpecLoc(),
1237 diag::err_invalid_storage_class_in_func_decl);
1238 DS.ClearStorageClassSpecs();
1241 // Parse the first declarator attached to this declspec.
1242 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1243 ParseDeclarator(ParmDeclarator);
1245 // Handle the full declarator list.
1247 // If attributes are present, parse them.
1248 MaybeParseGNUAttributes(ParmDeclarator);
1250 // Ask the actions module to compute the type for this declarator.
1252 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1255 // A missing identifier has already been diagnosed.
1256 ParmDeclarator.getIdentifier()) {
1258 // Scan the argument list looking for the correct param to apply this
1260 for (unsigned i = 0; ; ++i) {
1261 // C99 6.9.1p6: those declarators shall declare only identifiers from
1262 // the identifier list.
1263 if (i == FTI.NumParams) {
1264 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1265 << ParmDeclarator.getIdentifier();
1269 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1270 // Reject redefinitions of parameters.
1271 if (FTI.Params[i].Param) {
1272 Diag(ParmDeclarator.getIdentifierLoc(),
1273 diag::err_param_redefinition)
1274 << ParmDeclarator.getIdentifier();
1276 FTI.Params[i].Param = Param;
1283 // If we don't have a comma, it is either the end of the list (a ';') or
1284 // an error, bail out.
1285 if (Tok.isNot(tok::comma))
1288 ParmDeclarator.clear();
1290 // Consume the comma.
1291 ParmDeclarator.setCommaLoc(ConsumeToken());
1293 // Parse the next declarator.
1294 ParseDeclarator(ParmDeclarator);
1297 // Consume ';' and continue parsing.
1298 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1301 // Otherwise recover by skipping to next semi or mandatory function body.
1302 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1304 TryConsumeToken(tok::semi);
1307 // The actions module must verify that all arguments were declared.
1308 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1312 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1313 /// allowed to be a wide string, and is not subject to character translation.
1315 /// [GNU] asm-string-literal:
1318 ExprResult Parser::ParseAsmStringLiteral() {
1319 if (!isTokenStringLiteral()) {
1320 Diag(Tok, diag::err_expected_string_literal)
1321 << /*Source='in...'*/0 << "'asm'";
1325 ExprResult AsmString(ParseStringLiteralExpression());
1326 if (!AsmString.isInvalid()) {
1327 const auto *SL = cast<StringLiteral>(AsmString.get());
1328 if (!SL->isAscii()) {
1329 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1331 << SL->getSourceRange();
1340 /// [GNU] simple-asm-expr:
1341 /// 'asm' '(' asm-string-literal ')'
1343 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1344 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1345 SourceLocation Loc = ConsumeToken();
1347 if (Tok.is(tok::kw_volatile)) {
1348 // Remove from the end of 'asm' to the end of 'volatile'.
1349 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1350 PP.getLocForEndOfToken(Tok.getLocation()));
1352 Diag(Tok, diag::warn_file_asm_volatile)
1353 << FixItHint::CreateRemoval(RemovalRange);
1357 BalancedDelimiterTracker T(*this, tok::l_paren);
1358 if (T.consumeOpen()) {
1359 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1363 ExprResult Result(ParseAsmStringLiteral());
1365 if (!Result.isInvalid()) {
1366 // Close the paren and get the location of the end bracket
1369 *EndLoc = T.getCloseLocation();
1370 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1372 *EndLoc = Tok.getLocation();
1379 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1380 /// cleanup pool so that it gets destroyed when parsing the current top level
1381 /// declaration is finished.
1382 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1383 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1384 TemplateIdAnnotation *
1385 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1389 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1390 // Push the current token back into the token stream (or revert it if it is
1391 // cached) and use an annotation scope token for current token.
1392 if (PP.isBacktrackEnabled())
1393 PP.RevertCachedTokens(1);
1396 Tok.setKind(tok::annot_cxxscope);
1397 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1398 Tok.setAnnotationRange(SS.getRange());
1400 // In case the tokens were cached, have Preprocessor replace them
1401 // with the annotation token. We don't need to do this if we've
1402 // just reverted back to a prior state.
1403 if (IsNewAnnotation)
1404 PP.AnnotateCachedTokens(Tok);
1407 /// \brief Attempt to classify the name at the current token position. This may
1408 /// form a type, scope or primary expression annotation, or replace the token
1409 /// with a typo-corrected keyword. This is only appropriate when the current
1410 /// name must refer to an entity which has already been declared.
1412 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1413 /// and might possibly have a dependent nested name specifier.
1414 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1415 /// no typo correction will be performed.
1416 Parser::AnnotatedNameKind
1417 Parser::TryAnnotateName(bool IsAddressOfOperand,
1418 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1419 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1421 const bool EnteringContext = false;
1422 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1425 if (getLangOpts().CPlusPlus &&
1426 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1429 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1430 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, false, SS,
1431 !WasScopeAnnotation))
1433 return ANK_Unresolved;
1436 IdentifierInfo *Name = Tok.getIdentifierInfo();
1437 SourceLocation NameLoc = Tok.getLocation();
1439 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1440 // typo-correct to tentatively-declared identifiers.
1441 if (isTentativelyDeclared(Name)) {
1442 // Identifier has been tentatively declared, and thus cannot be resolved as
1443 // an expression. Fall back to annotating it as a type.
1444 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, false, SS,
1445 !WasScopeAnnotation))
1447 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1450 Token Next = NextToken();
1452 // Look up and classify the identifier. We don't perform any typo-correction
1453 // after a scope specifier, because in general we can't recover from typos
1454 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1455 // jump back into scope specifier parsing).
1456 Sema::NameClassification Classification = Actions.ClassifyName(
1457 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1458 SS.isEmpty() ? std::move(CCC) : nullptr);
1460 switch (Classification.getKind()) {
1461 case Sema::NC_Error:
1464 case Sema::NC_Keyword:
1465 // The identifier was typo-corrected to a keyword.
1466 Tok.setIdentifierInfo(Name);
1467 Tok.setKind(Name->getTokenID());
1468 PP.TypoCorrectToken(Tok);
1469 if (SS.isNotEmpty())
1470 AnnotateScopeToken(SS, !WasScopeAnnotation);
1471 // We've "annotated" this as a keyword.
1474 case Sema::NC_Unknown:
1475 // It's not something we know about. Leave it unannotated.
1478 case Sema::NC_Type: {
1479 SourceLocation BeginLoc = NameLoc;
1480 if (SS.isNotEmpty())
1481 BeginLoc = SS.getBeginLoc();
1483 /// An Objective-C object type followed by '<' is a specialization of
1484 /// a parameterized class type or a protocol-qualified type.
1485 ParsedType Ty = Classification.getType();
1486 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1487 (Ty.get()->isObjCObjectType() ||
1488 Ty.get()->isObjCObjectPointerType())) {
1489 // Consume the name.
1490 SourceLocation IdentifierLoc = ConsumeToken();
1491 SourceLocation NewEndLoc;
1493 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1494 /*consumeLastToken=*/false,
1496 if (NewType.isUsable())
1500 Tok.setKind(tok::annot_typename);
1501 setTypeAnnotation(Tok, Ty);
1502 Tok.setAnnotationEndLoc(Tok.getLocation());
1503 Tok.setLocation(BeginLoc);
1504 PP.AnnotateCachedTokens(Tok);
1508 case Sema::NC_Expression:
1509 Tok.setKind(tok::annot_primary_expr);
1510 setExprAnnotation(Tok, Classification.getExpression());
1511 Tok.setAnnotationEndLoc(NameLoc);
1512 if (SS.isNotEmpty())
1513 Tok.setLocation(SS.getBeginLoc());
1514 PP.AnnotateCachedTokens(Tok);
1517 case Sema::NC_TypeTemplate:
1518 if (Next.isNot(tok::less)) {
1519 // This may be a type template being used as a template template argument.
1520 if (SS.isNotEmpty())
1521 AnnotateScopeToken(SS, !WasScopeAnnotation);
1522 return ANK_TemplateName;
1525 case Sema::NC_VarTemplate:
1526 case Sema::NC_FunctionTemplate: {
1527 // We have a type, variable or function template followed by '<'.
1530 Id.setIdentifier(Name, NameLoc);
1531 if (AnnotateTemplateIdToken(
1532 TemplateTy::make(Classification.getTemplateName()),
1533 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1538 case Sema::NC_NestedNameSpecifier:
1539 llvm_unreachable("already parsed nested name specifier");
1542 // Unable to classify the name, but maybe we can annotate a scope specifier.
1543 if (SS.isNotEmpty())
1544 AnnotateScopeToken(SS, !WasScopeAnnotation);
1545 return ANK_Unresolved;
1548 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1549 assert(Tok.isNot(tok::identifier));
1550 Diag(Tok, diag::ext_keyword_as_ident)
1551 << PP.getSpelling(Tok)
1554 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1555 Tok.setKind(tok::identifier);
1559 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1560 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1561 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1562 /// with a single annotation token representing the typename or C++ scope
1564 /// This simplifies handling of C++ scope specifiers and allows efficient
1565 /// backtracking without the need to re-parse and resolve nested-names and
1567 /// It will mainly be called when we expect to treat identifiers as typenames
1568 /// (if they are typenames). For example, in C we do not expect identifiers
1569 /// inside expressions to be treated as typenames so it will not be called
1570 /// for expressions in C.
1571 /// The benefit for C/ObjC is that a typename will be annotated and
1572 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1573 /// will not be called twice, once to check whether we have a declaration
1574 /// specifier, and another one to get the actual type inside
1575 /// ParseDeclarationSpecifiers).
1577 /// This returns true if an error occurred.
1579 /// Note that this routine emits an error if you call it with ::new or ::delete
1580 /// as the current tokens, so only call it in contexts where these are invalid.
1581 bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext, bool NeedType) {
1582 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1583 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1584 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1585 Tok.is(tok::kw___super)) &&
1586 "Cannot be a type or scope token!");
1588 if (Tok.is(tok::kw_typename)) {
1589 // MSVC lets you do stuff like:
1590 // typename typedef T_::D D;
1592 // We will consume the typedef token here and put it back after we have
1593 // parsed the first identifier, transforming it into something more like:
1594 // typename T_::D typedef D;
1595 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1597 PP.Lex(TypedefToken);
1598 bool Result = TryAnnotateTypeOrScopeToken(EnteringContext, NeedType);
1602 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1606 // Parse a C++ typename-specifier, e.g., "typename T::type".
1608 // typename-specifier:
1609 // 'typename' '::' [opt] nested-name-specifier identifier
1610 // 'typename' '::' [opt] nested-name-specifier template [opt]
1611 // simple-template-id
1612 SourceLocation TypenameLoc = ConsumeToken();
1614 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1615 /*EnteringContext=*/false, nullptr,
1616 /*IsTypename*/ true))
1619 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1620 Tok.is(tok::annot_decltype)) {
1621 // Attempt to recover by skipping the invalid 'typename'
1622 if (Tok.is(tok::annot_decltype) ||
1623 (!TryAnnotateTypeOrScopeToken(EnteringContext, NeedType) &&
1624 Tok.isAnnotation())) {
1625 unsigned DiagID = diag::err_expected_qualified_after_typename;
1626 // MS compatibility: MSVC permits using known types with typename.
1627 // e.g. "typedef typename T* pointer_type"
1628 if (getLangOpts().MicrosoftExt)
1629 DiagID = diag::warn_expected_qualified_after_typename;
1630 Diag(Tok.getLocation(), DiagID);
1635 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1640 if (Tok.is(tok::identifier)) {
1641 // FIXME: check whether the next token is '<', first!
1642 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1643 *Tok.getIdentifierInfo(),
1645 } else if (Tok.is(tok::annot_template_id)) {
1646 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1647 if (TemplateId->Kind != TNK_Type_template &&
1648 TemplateId->Kind != TNK_Dependent_template_name) {
1649 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1650 << Tok.getAnnotationRange();
1654 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1655 TemplateId->NumArgs);
1657 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1658 TemplateId->TemplateKWLoc,
1659 TemplateId->Template,
1660 TemplateId->TemplateNameLoc,
1661 TemplateId->LAngleLoc,
1663 TemplateId->RAngleLoc);
1665 Diag(Tok, diag::err_expected_type_name_after_typename)
1670 SourceLocation EndLoc = Tok.getLastLoc();
1671 Tok.setKind(tok::annot_typename);
1672 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1673 Tok.setAnnotationEndLoc(EndLoc);
1674 Tok.setLocation(TypenameLoc);
1675 PP.AnnotateCachedTokens(Tok);
1679 // Remembers whether the token was originally a scope annotation.
1680 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1683 if (getLangOpts().CPlusPlus)
1684 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1687 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, NeedType,
1688 SS, !WasScopeAnnotation);
1691 /// \brief Try to annotate a type or scope token, having already parsed an
1692 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1693 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1694 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(bool EnteringContext,
1698 if (Tok.is(tok::identifier)) {
1699 IdentifierInfo *CorrectedII = nullptr;
1700 // Determine whether the identifier is a type name.
1701 if (ParsedType Ty = Actions.getTypeName(
1702 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1703 false, NextToken().is(tok::period), nullptr,
1704 /*IsCtorOrDtorName=*/false,
1705 /*NonTrivialTypeSourceInfo*/ true,
1706 NeedType ? &CorrectedII : nullptr)) {
1707 // A FixIt was applied as a result of typo correction
1709 Tok.setIdentifierInfo(CorrectedII);
1711 SourceLocation BeginLoc = Tok.getLocation();
1712 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1713 BeginLoc = SS.getBeginLoc();
1715 /// An Objective-C object type followed by '<' is a specialization of
1716 /// a parameterized class type or a protocol-qualified type.
1717 if (getLangOpts().ObjC1 && NextToken().is(tok::less) &&
1718 (Ty.get()->isObjCObjectType() ||
1719 Ty.get()->isObjCObjectPointerType())) {
1720 // Consume the name.
1721 SourceLocation IdentifierLoc = ConsumeToken();
1722 SourceLocation NewEndLoc;
1724 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1725 /*consumeLastToken=*/false,
1727 if (NewType.isUsable())
1731 // This is a typename. Replace the current token in-place with an
1732 // annotation type token.
1733 Tok.setKind(tok::annot_typename);
1734 setTypeAnnotation(Tok, Ty);
1735 Tok.setAnnotationEndLoc(Tok.getLocation());
1736 Tok.setLocation(BeginLoc);
1738 // In case the tokens were cached, have Preprocessor replace
1739 // them with the annotation token.
1740 PP.AnnotateCachedTokens(Tok);
1744 if (!getLangOpts().CPlusPlus) {
1745 // If we're in C, we can't have :: tokens at all (the lexer won't return
1746 // them). If the identifier is not a type, then it can't be scope either,
1751 // If this is a template-id, annotate with a template-id or type token.
1752 if (NextToken().is(tok::less)) {
1753 TemplateTy Template;
1754 UnqualifiedId TemplateName;
1755 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1756 bool MemberOfUnknownSpecialization;
1757 if (TemplateNameKind TNK =
1758 Actions.isTemplateName(getCurScope(), SS,
1759 /*hasTemplateKeyword=*/false, TemplateName,
1760 /*ObjectType=*/nullptr, EnteringContext,
1761 Template, MemberOfUnknownSpecialization)) {
1762 // Consume the identifier.
1764 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1766 // If an unrecoverable error occurred, we need to return true here,
1767 // because the token stream is in a damaged state. We may not return
1768 // a valid identifier.
1774 // The current token, which is either an identifier or a
1775 // template-id, is not part of the annotation. Fall through to
1776 // push that token back into the stream and complete the C++ scope
1777 // specifier annotation.
1780 if (Tok.is(tok::annot_template_id)) {
1781 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1782 if (TemplateId->Kind == TNK_Type_template) {
1783 // A template-id that refers to a type was parsed into a
1784 // template-id annotation in a context where we weren't allowed
1785 // to produce a type annotation token. Update the template-id
1786 // annotation token to a type annotation token now.
1787 AnnotateTemplateIdTokenAsType();
1795 // A C++ scope specifier that isn't followed by a typename.
1796 AnnotateScopeToken(SS, IsNewScope);
1800 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1801 /// annotates C++ scope specifiers and template-ids. This returns
1802 /// true if there was an error that could not be recovered from.
1804 /// Note that this routine emits an error if you call it with ::new or ::delete
1805 /// as the current tokens, so only call it in contexts where these are invalid.
1806 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1807 assert(getLangOpts().CPlusPlus &&
1808 "Call sites of this function should be guarded by checking for C++");
1809 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1810 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1811 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1812 "Cannot be a type or scope token!");
1815 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1820 AnnotateScopeToken(SS, true);
1824 bool Parser::isTokenEqualOrEqualTypo() {
1825 tok::TokenKind Kind = Tok.getKind();
1829 case tok::ampequal: // &=
1830 case tok::starequal: // *=
1831 case tok::plusequal: // +=
1832 case tok::minusequal: // -=
1833 case tok::exclaimequal: // !=
1834 case tok::slashequal: // /=
1835 case tok::percentequal: // %=
1836 case tok::lessequal: // <=
1837 case tok::lesslessequal: // <<=
1838 case tok::greaterequal: // >=
1839 case tok::greatergreaterequal: // >>=
1840 case tok::caretequal: // ^=
1841 case tok::pipeequal: // |=
1842 case tok::equalequal: // ==
1843 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1845 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1851 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1852 assert(Tok.is(tok::code_completion));
1853 PrevTokLocation = Tok.getLocation();
1855 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1856 if (S->getFlags() & Scope::FnScope) {
1857 Actions.CodeCompleteOrdinaryName(getCurScope(),
1858 Sema::PCC_RecoveryInFunction);
1860 return PrevTokLocation;
1863 if (S->getFlags() & Scope::ClassScope) {
1864 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1866 return PrevTokLocation;
1870 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1872 return PrevTokLocation;
1875 // Code-completion pass-through functions
1877 void Parser::CodeCompleteDirective(bool InConditional) {
1878 Actions.CodeCompletePreprocessorDirective(InConditional);
1881 void Parser::CodeCompleteInConditionalExclusion() {
1882 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1885 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1886 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1889 void Parser::CodeCompletePreprocessorExpression() {
1890 Actions.CodeCompletePreprocessorExpression();
1893 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1894 MacroInfo *MacroInfo,
1895 unsigned ArgumentIndex) {
1896 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1900 void Parser::CodeCompleteNaturalLanguage() {
1901 Actions.CodeCompleteNaturalLanguage();
1904 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1905 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1906 "Expected '__if_exists' or '__if_not_exists'");
1907 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1908 Result.KeywordLoc = ConsumeToken();
1910 BalancedDelimiterTracker T(*this, tok::l_paren);
1911 if (T.consumeOpen()) {
1912 Diag(Tok, diag::err_expected_lparen_after)
1913 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1917 // Parse nested-name-specifier.
1918 if (getLangOpts().CPlusPlus)
1919 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1920 /*EnteringContext=*/false);
1922 // Check nested-name specifier.
1923 if (Result.SS.isInvalid()) {
1928 // Parse the unqualified-id.
1929 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1930 if (ParseUnqualifiedId(Result.SS, false, true, true, nullptr, TemplateKWLoc,
1936 if (T.consumeClose())
1939 // Check if the symbol exists.
1940 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1941 Result.IsIfExists, Result.SS,
1943 case Sema::IER_Exists:
1944 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1947 case Sema::IER_DoesNotExist:
1948 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
1951 case Sema::IER_Dependent:
1952 Result.Behavior = IEB_Dependent;
1955 case Sema::IER_Error:
1962 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
1963 IfExistsCondition Result;
1964 if (ParseMicrosoftIfExistsCondition(Result))
1967 BalancedDelimiterTracker Braces(*this, tok::l_brace);
1968 if (Braces.consumeOpen()) {
1969 Diag(Tok, diag::err_expected) << tok::l_brace;
1973 switch (Result.Behavior) {
1975 // Parse declarations below.
1979 llvm_unreachable("Cannot have a dependent external declaration");
1986 // Parse the declarations.
1987 // FIXME: Support module import within __if_exists?
1988 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
1989 ParsedAttributesWithRange attrs(AttrFactory);
1990 MaybeParseCXX11Attributes(attrs);
1991 MaybeParseMicrosoftAttributes(attrs);
1992 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
1993 if (Result && !getCurScope()->getParent())
1994 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
1996 Braces.consumeClose();
1999 Parser::DeclGroupPtrTy Parser::ParseModuleImport(SourceLocation AtLoc) {
2000 assert(Tok.isObjCAtKeyword(tok::objc_import) &&
2001 "Improper start to module import");
2002 SourceLocation ImportLoc = ConsumeToken();
2004 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2006 // Parse the module path.
2008 if (!Tok.is(tok::identifier)) {
2009 if (Tok.is(tok::code_completion)) {
2010 Actions.CodeCompleteModuleImport(ImportLoc, Path);
2015 Diag(Tok, diag::err_module_expected_ident);
2016 SkipUntil(tok::semi);
2020 // Record this part of the module path.
2021 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2024 if (Tok.is(tok::period)) {
2032 if (PP.hadModuleLoaderFatalFailure()) {
2033 // With a fatal failure in the module loader, we abort parsing.
2038 DeclResult Import = Actions.ActOnModuleImport(AtLoc, ImportLoc, Path);
2039 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2040 if (Import.isInvalid())
2043 return Actions.ConvertDeclToDeclGroup(Import.get());
2046 /// \brief Try recover parser when module annotation appears where it must not
2048 /// \returns false if the recover was successful and parsing may be continued, or
2049 /// true if parser must bail out to top level and handle the token there.
2050 bool Parser::parseMisplacedModuleImport() {
2052 switch (Tok.getKind()) {
2053 case tok::annot_module_end:
2054 // Inform caller that recovery failed, the error must be handled at upper
2057 case tok::annot_module_begin:
2058 Actions.diagnoseMisplacedModuleImport(reinterpret_cast<Module *>(
2059 Tok.getAnnotationValue()), Tok.getLocation());
2061 case tok::annot_module_include:
2062 // Module import found where it should not be, for instance, inside a
2063 // namespace. Recover by importing the module.
2064 Actions.ActOnModuleInclude(Tok.getLocation(),
2065 reinterpret_cast<Module *>(
2066 Tok.getAnnotationValue()));
2068 // If there is another module import, process it.
2077 bool BalancedDelimiterTracker::diagnoseOverflow() {
2078 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2079 << P.getLangOpts().BracketDepth;
2080 P.Diag(P.Tok, diag::note_bracket_depth);
2085 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2087 tok::TokenKind SkipToTok) {
2088 LOpen = P.Tok.getLocation();
2089 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2090 if (SkipToTok != tok::unknown)
2091 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2095 if (getDepth() < MaxDepth)
2098 return diagnoseOverflow();
2101 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2102 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2104 if (P.Tok.is(tok::annot_module_end))
2105 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2107 P.Diag(P.Tok, diag::err_expected) << Close;
2108 P.Diag(LOpen, diag::note_matching) << Kind;
2110 // If we're not already at some kind of closing bracket, skip to our closing
2112 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2113 P.Tok.isNot(tok::r_square) &&
2114 P.SkipUntil(Close, FinalToken,
2115 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2117 LClose = P.ConsumeAnyToken();
2121 void BalancedDelimiterTracker::skipToEnd() {
2122 P.SkipUntil(Close, Parser::StopBeforeMatch);