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_end:
286 // Stop before an OpenMP pragma boundary.
287 case tok::annot_module_begin:
288 case tok::annot_module_end:
289 case tok::annot_module_include:
290 // Stop before we change submodules. They generally indicate a "good"
291 // place to pick up parsing again (except in the special case where
292 // we're trying to skip to EOF).
295 case tok::code_completion:
296 if (!HasFlagsSet(Flags, StopAtCodeCompletion))
297 handleUnexpectedCodeCompletionToken();
301 // Recursively skip properly-nested parens.
303 if (HasFlagsSet(Flags, StopAtCodeCompletion))
304 SkipUntil(tok::r_paren, StopAtCodeCompletion);
306 SkipUntil(tok::r_paren);
309 // Recursively skip properly-nested square brackets.
311 if (HasFlagsSet(Flags, StopAtCodeCompletion))
312 SkipUntil(tok::r_square, StopAtCodeCompletion);
314 SkipUntil(tok::r_square);
317 // Recursively skip properly-nested braces.
319 if (HasFlagsSet(Flags, StopAtCodeCompletion))
320 SkipUntil(tok::r_brace, StopAtCodeCompletion);
322 SkipUntil(tok::r_brace);
325 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
326 // Since the user wasn't looking for this token (if they were, it would
327 // already be handled), this isn't balanced. If there is a LHS token at a
328 // higher level, we will assume that this matches the unbalanced token
329 // and return it. Otherwise, this is a spurious RHS token, which we skip.
331 if (ParenCount && !isFirstTokenSkipped)
332 return false; // Matches something.
336 if (BracketCount && !isFirstTokenSkipped)
337 return false; // Matches something.
341 if (BraceCount && !isFirstTokenSkipped)
342 return false; // Matches something.
346 case tok::string_literal:
347 case tok::wide_string_literal:
348 case tok::utf8_string_literal:
349 case tok::utf16_string_literal:
350 case tok::utf32_string_literal:
351 ConsumeStringToken();
355 if (HasFlagsSet(Flags, StopAtSemi))
363 isFirstTokenSkipped = false;
367 //===----------------------------------------------------------------------===//
368 // Scope manipulation
369 //===----------------------------------------------------------------------===//
371 /// EnterScope - Start a new scope.
372 void Parser::EnterScope(unsigned ScopeFlags) {
373 if (NumCachedScopes) {
374 Scope *N = ScopeCache[--NumCachedScopes];
375 N->Init(getCurScope(), ScopeFlags);
376 Actions.CurScope = N;
378 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
382 /// ExitScope - Pop a scope off the scope stack.
383 void Parser::ExitScope() {
384 assert(getCurScope() && "Scope imbalance!");
386 // Inform the actions module that this scope is going away if there are any
388 Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
390 Scope *OldScope = getCurScope();
391 Actions.CurScope = OldScope->getParent();
393 if (NumCachedScopes == ScopeCacheSize)
396 ScopeCache[NumCachedScopes++] = OldScope;
399 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
400 /// this object does nothing.
401 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
403 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
405 OldFlags = CurScope->getFlags();
406 CurScope->setFlags(ScopeFlags);
410 /// Restore the flags for the current scope to what they were before this
411 /// object overrode them.
412 Parser::ParseScopeFlags::~ParseScopeFlags() {
414 CurScope->setFlags(OldFlags);
418 //===----------------------------------------------------------------------===//
419 // C99 6.9: External Definitions.
420 //===----------------------------------------------------------------------===//
423 // If we still have scopes active, delete the scope tree.
424 delete getCurScope();
425 Actions.CurScope = nullptr;
427 // Free the scope cache.
428 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
429 delete ScopeCache[i];
431 resetPragmaHandlers();
433 PP.removeCommentHandler(CommentSemaHandler.get());
435 PP.clearCodeCompletionHandler();
437 if (getLangOpts().DelayedTemplateParsing &&
438 !PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
439 // If an ASTConsumer parsed delay-parsed templates in their
440 // HandleTranslationUnit() method, TemplateIds created there were not
441 // guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
442 // ParseTopLevelDecl(). Destroy them here.
443 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
446 assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
449 /// Initialize - Warm up the parser.
451 void Parser::Initialize() {
452 // Create the translation unit scope. Install it as the current scope.
453 assert(getCurScope() == nullptr && "A scope is already active?");
454 EnterScope(Scope::DeclScope);
455 Actions.ActOnTranslationUnitScope(getCurScope());
457 // Initialization for Objective-C context sensitive keywords recognition.
458 // Referenced in Parser::ParseObjCTypeQualifierList.
459 if (getLangOpts().ObjC1) {
460 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
461 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
462 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
463 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
464 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
465 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
466 ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
467 ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
468 ObjCTypeQuals[objc_null_unspecified]
469 = &PP.getIdentifierTable().get("null_unspecified");
472 Ident_instancetype = nullptr;
473 Ident_final = nullptr;
474 Ident_sealed = nullptr;
475 Ident_override = nullptr;
477 Ident_super = &PP.getIdentifierTable().get("super");
479 if (getLangOpts().AltiVec) {
480 Ident_vector = &PP.getIdentifierTable().get("vector");
481 Ident_pixel = &PP.getIdentifierTable().get("pixel");
482 Ident_bool = &PP.getIdentifierTable().get("bool");
485 Ident_introduced = nullptr;
486 Ident_deprecated = nullptr;
487 Ident_obsoleted = nullptr;
488 Ident_unavailable = nullptr;
490 Ident__except = nullptr;
492 Ident__exception_code = Ident__exception_info = nullptr;
493 Ident__abnormal_termination = Ident___exception_code = nullptr;
494 Ident___exception_info = Ident___abnormal_termination = nullptr;
495 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
496 Ident_AbnormalTermination = nullptr;
498 if(getLangOpts().Borland) {
499 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
500 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
501 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
502 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
503 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
504 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
505 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
506 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
507 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
509 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
510 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
511 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
512 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
513 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
514 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
515 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
516 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
517 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
520 Actions.Initialize();
522 // Prime the lexer look-ahead.
526 void Parser::LateTemplateParserCleanupCallback(void *P) {
527 // While this RAII helper doesn't bracket any actual work, the destructor will
528 // clean up annotations that were created during ActOnEndOfTranslationUnit
529 // when incremental processing is enabled.
530 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
533 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
534 /// action tells us to. This returns true if the EOF was encountered.
535 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
536 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
538 // Skip over the EOF token, flagging end of previous input for incremental
540 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
543 Result = DeclGroupPtrTy();
544 switch (Tok.getKind()) {
545 case tok::annot_pragma_unused:
546 HandlePragmaUnused();
549 case tok::annot_module_include:
550 Actions.ActOnModuleInclude(Tok.getLocation(),
551 reinterpret_cast<Module *>(
552 Tok.getAnnotationValue()));
556 case tok::annot_module_begin:
557 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
558 Tok.getAnnotationValue()));
562 case tok::annot_module_end:
563 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
564 Tok.getAnnotationValue()));
569 // Late template parsing can begin.
570 if (getLangOpts().DelayedTemplateParsing)
571 Actions.SetLateTemplateParser(LateTemplateParserCallback,
572 PP.isIncrementalProcessingEnabled() ?
573 LateTemplateParserCleanupCallback : nullptr,
575 if (!PP.isIncrementalProcessingEnabled())
576 Actions.ActOnEndOfTranslationUnit();
577 //else don't tell Sema that we ended parsing: more input might come.
584 ParsedAttributesWithRange attrs(AttrFactory);
585 MaybeParseCXX11Attributes(attrs);
586 MaybeParseMicrosoftAttributes(attrs);
588 Result = ParseExternalDeclaration(attrs);
592 /// ParseExternalDeclaration:
594 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
595 /// function-definition
597 /// [GNU] asm-definition
598 /// [GNU] __extension__ external-declaration
599 /// [OBJC] objc-class-definition
600 /// [OBJC] objc-class-declaration
601 /// [OBJC] objc-alias-declaration
602 /// [OBJC] objc-protocol-definition
603 /// [OBJC] objc-method-definition
605 /// [C++] linkage-specification
606 /// [GNU] asm-definition:
607 /// simple-asm-expr ';'
608 /// [C++11] empty-declaration
609 /// [C++11] attribute-declaration
611 /// [C++11] empty-declaration:
614 /// [C++0x/GNU] 'extern' 'template' declaration
615 Parser::DeclGroupPtrTy
616 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
617 ParsingDeclSpec *DS) {
618 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
619 ParenBraceBracketBalancer BalancerRAIIObj(*this);
621 if (PP.isCodeCompletionReached()) {
623 return DeclGroupPtrTy();
626 Decl *SingleDecl = nullptr;
627 switch (Tok.getKind()) {
628 case tok::annot_pragma_vis:
629 HandlePragmaVisibility();
630 return DeclGroupPtrTy();
631 case tok::annot_pragma_pack:
633 return DeclGroupPtrTy();
634 case tok::annot_pragma_msstruct:
635 HandlePragmaMSStruct();
636 return DeclGroupPtrTy();
637 case tok::annot_pragma_align:
639 return DeclGroupPtrTy();
640 case tok::annot_pragma_weak:
642 return DeclGroupPtrTy();
643 case tok::annot_pragma_weakalias:
644 HandlePragmaWeakAlias();
645 return DeclGroupPtrTy();
646 case tok::annot_pragma_redefine_extname:
647 HandlePragmaRedefineExtname();
648 return DeclGroupPtrTy();
649 case tok::annot_pragma_fp_contract:
650 HandlePragmaFPContract();
651 return DeclGroupPtrTy();
652 case tok::annot_pragma_opencl_extension:
653 HandlePragmaOpenCLExtension();
654 return DeclGroupPtrTy();
655 case tok::annot_pragma_openmp:
656 return ParseOpenMPDeclarativeDirective();
657 case tok::annot_pragma_ms_pointers_to_members:
658 HandlePragmaMSPointersToMembers();
659 return DeclGroupPtrTy();
660 case tok::annot_pragma_ms_vtordisp:
661 HandlePragmaMSVtorDisp();
662 return DeclGroupPtrTy();
663 case tok::annot_pragma_ms_pragma:
664 HandlePragmaMSPragma();
665 return DeclGroupPtrTy();
667 // Either a C++11 empty-declaration or attribute-declaration.
668 SingleDecl = Actions.ActOnEmptyDeclaration(getCurScope(),
671 ConsumeExtraSemi(OutsideFunction);
674 Diag(Tok, diag::err_extraneous_closing_brace);
676 return DeclGroupPtrTy();
678 Diag(Tok, diag::err_expected_external_declaration);
679 return DeclGroupPtrTy();
680 case tok::kw___extension__: {
681 // __extension__ silences extension warnings in the subexpression.
682 ExtensionRAIIObject O(Diags); // Use RAII to do this.
684 return ParseExternalDeclaration(attrs);
687 ProhibitAttributes(attrs);
689 SourceLocation StartLoc = Tok.getLocation();
690 SourceLocation EndLoc;
692 ExprResult Result(ParseSimpleAsm(&EndLoc));
694 // Check if GNU-style InlineAsm is disabled.
695 // Empty asm string is allowed because it will not introduce
696 // any assembly code.
697 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
698 const auto *SL = cast<StringLiteral>(Result.get());
699 if (!SL->getString().trim().empty())
700 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
703 ExpectAndConsume(tok::semi, diag::err_expected_after,
704 "top-level asm block");
706 if (Result.isInvalid())
707 return DeclGroupPtrTy();
708 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
712 return ParseObjCAtDirectives();
715 if (!getLangOpts().ObjC1) {
716 Diag(Tok, diag::err_expected_external_declaration);
718 return DeclGroupPtrTy();
720 SingleDecl = ParseObjCMethodDefinition();
722 case tok::code_completion:
723 Actions.CodeCompleteOrdinaryName(getCurScope(),
724 CurParsedObjCImpl? Sema::PCC_ObjCImplementation
725 : Sema::PCC_Namespace);
727 return DeclGroupPtrTy();
729 case tok::kw_namespace:
730 case tok::kw_typedef:
731 case tok::kw_template:
732 case tok::kw_export: // As in 'export template'
733 case tok::kw_static_assert:
734 case tok::kw__Static_assert:
735 // A function definition cannot start with any of these keywords.
737 SourceLocation DeclEnd;
738 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
742 // Parse (then ignore) 'static' prior to a template instantiation. This is
743 // a GCC extension that we intentionally do not support.
744 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
745 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
747 SourceLocation DeclEnd;
748 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
753 if (getLangOpts().CPlusPlus) {
754 tok::TokenKind NextKind = NextToken().getKind();
756 // Inline namespaces. Allowed as an extension even in C++03.
757 if (NextKind == tok::kw_namespace) {
758 SourceLocation DeclEnd;
759 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
762 // Parse (then ignore) 'inline' prior to a template instantiation. This is
763 // a GCC extension that we intentionally do not support.
764 if (NextKind == tok::kw_template) {
765 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
767 SourceLocation DeclEnd;
768 return ParseDeclaration(Declarator::FileContext, DeclEnd, attrs);
774 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
776 SourceLocation ExternLoc = ConsumeToken();
777 SourceLocation TemplateLoc = ConsumeToken();
778 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
779 diag::warn_cxx98_compat_extern_template :
780 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
781 SourceLocation DeclEnd;
782 return Actions.ConvertDeclToDeclGroup(
783 ParseExplicitInstantiation(Declarator::FileContext,
784 ExternLoc, TemplateLoc, DeclEnd));
788 case tok::kw___if_exists:
789 case tok::kw___if_not_exists:
790 ParseMicrosoftIfExistsExternalDeclaration();
791 return DeclGroupPtrTy();
795 // We can't tell whether this is a function-definition or declaration yet.
796 return ParseDeclarationOrFunctionDefinition(attrs, DS);
799 // This routine returns a DeclGroup, if the thing we parsed only contains a
800 // single decl, convert it now.
801 return Actions.ConvertDeclToDeclGroup(SingleDecl);
804 /// \brief Determine whether the current token, if it occurs after a
805 /// declarator, continues a declaration or declaration list.
806 bool Parser::isDeclarationAfterDeclarator() {
807 // Check for '= delete' or '= default'
808 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
809 const Token &KW = NextToken();
810 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
814 return Tok.is(tok::equal) || // int X()= -> not a function def
815 Tok.is(tok::comma) || // int X(), -> not a function def
816 Tok.is(tok::semi) || // int X(); -> not a function def
817 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
818 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
819 (getLangOpts().CPlusPlus &&
820 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
823 /// \brief Determine whether the current token, if it occurs after a
824 /// declarator, indicates the start of a function definition.
825 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
826 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
827 if (Tok.is(tok::l_brace)) // int X() {}
830 // Handle K&R C argument lists: int X(f) int f; {}
831 if (!getLangOpts().CPlusPlus &&
832 Declarator.getFunctionTypeInfo().isKNRPrototype())
833 return isDeclarationSpecifier();
835 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
836 const Token &KW = NextToken();
837 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
840 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
841 Tok.is(tok::kw_try); // X() try { ... }
844 /// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or
845 /// a declaration. We can't tell which we have until we read up to the
846 /// compound-statement in function-definition. TemplateParams, if
847 /// non-NULL, provides the template parameters when we're parsing a
848 /// C++ template-declaration.
850 /// function-definition: [C99 6.9.1]
851 /// decl-specs declarator declaration-list[opt] compound-statement
852 /// [C90] function-definition: [C99 6.7.1] - implicit int result
853 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
855 /// declaration: [C99 6.7]
856 /// declaration-specifiers init-declarator-list[opt] ';'
857 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
858 /// [OMP] threadprivate-directive [TODO]
860 Parser::DeclGroupPtrTy
861 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
863 AccessSpecifier AS) {
864 // Parse the common declaration-specifiers piece.
865 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
867 // If we had a free-standing type definition with a missing semicolon, we
868 // may get this far before the problem becomes obvious.
869 if (DS.hasTagDefinition() &&
870 DiagnoseMissingSemiAfterTagDefinition(DS, AS, DSC_top_level))
871 return DeclGroupPtrTy();
873 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
874 // declaration-specifiers init-declarator-list[opt] ';'
875 if (Tok.is(tok::semi)) {
876 ProhibitAttributes(attrs);
878 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
879 DS.complete(TheDecl);
880 return Actions.ConvertDeclToDeclGroup(TheDecl);
883 DS.takeAttributesFrom(attrs);
885 // ObjC2 allows prefix attributes on class interfaces and protocols.
886 // FIXME: This still needs better diagnostics. We should only accept
887 // attributes here, no types, etc.
888 if (getLangOpts().ObjC2 && Tok.is(tok::at)) {
889 SourceLocation AtLoc = ConsumeToken(); // the "@"
890 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
891 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
892 Diag(Tok, diag::err_objc_unexpected_attr);
893 SkipUntil(tok::semi); // FIXME: better skip?
894 return DeclGroupPtrTy();
899 const char *PrevSpec = nullptr;
901 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
902 Actions.getASTContext().getPrintingPolicy()))
903 Diag(AtLoc, DiagID) << PrevSpec;
905 if (Tok.isObjCAtKeyword(tok::objc_protocol))
906 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
908 return Actions.ConvertDeclToDeclGroup(
909 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
912 // If the declspec consisted only of 'extern' and we have a string
913 // literal following it, this must be a C++ linkage specifier like
915 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
916 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
917 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
918 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
919 return Actions.ConvertDeclToDeclGroup(TheDecl);
922 return ParseDeclGroup(DS, Declarator::FileContext);
925 Parser::DeclGroupPtrTy
926 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
928 AccessSpecifier AS) {
930 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
932 ParsingDeclSpec PDS(*this);
933 // Must temporarily exit the objective-c container scope for
934 // parsing c constructs and re-enter objc container scope
936 ObjCDeclContextSwitch ObjCDC(*this);
938 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
942 /// ParseFunctionDefinition - We parsed and verified that the specified
943 /// Declarator is well formed. If this is a K&R-style function, read the
944 /// parameters declaration-list, then start the compound-statement.
946 /// function-definition: [C99 6.9.1]
947 /// decl-specs declarator declaration-list[opt] compound-statement
948 /// [C90] function-definition: [C99 6.7.1] - implicit int result
949 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
950 /// [C++] function-definition: [C++ 8.4]
951 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
953 /// [C++] function-definition: [C++ 8.4]
954 /// decl-specifier-seq[opt] declarator function-try-block
956 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
957 const ParsedTemplateInfo &TemplateInfo,
958 LateParsedAttrList *LateParsedAttrs) {
959 // Poison SEH identifiers so they are flagged as illegal in function bodies.
960 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
961 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
963 // If this is C90 and the declspecs were completely missing, fudge in an
964 // implicit int. We do this here because this is the only place where
965 // declaration-specifiers are completely optional in the grammar.
966 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
967 const char *PrevSpec;
969 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
970 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
971 D.getIdentifierLoc(),
974 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
977 // If this declaration was formed with a K&R-style identifier list for the
978 // arguments, parse declarations for all of the args next.
979 // int foo(a,b) int a; float b; {}
980 if (FTI.isKNRPrototype())
981 ParseKNRParamDeclarations(D);
983 // We should have either an opening brace or, in a C++ constructor,
984 // we may have a colon.
985 if (Tok.isNot(tok::l_brace) &&
986 (!getLangOpts().CPlusPlus ||
987 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
988 Tok.isNot(tok::equal)))) {
989 Diag(Tok, diag::err_expected_fn_body);
991 // Skip over garbage, until we get to '{'. Don't eat the '{'.
992 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
994 // If we didn't find the '{', bail out.
995 if (Tok.isNot(tok::l_brace))
999 // Check to make sure that any normal attributes are allowed to be on
1000 // a definition. Late parsed attributes are checked at the end.
1001 if (Tok.isNot(tok::equal)) {
1002 AttributeList *DtorAttrs = D.getAttributes();
1004 if (DtorAttrs->isKnownToGCC() &&
1005 !DtorAttrs->isCXX11Attribute()) {
1006 Diag(DtorAttrs->getLoc(), diag::warn_attribute_on_function_definition)
1007 << DtorAttrs->getName();
1009 DtorAttrs = DtorAttrs->getNext();
1013 // In delayed template parsing mode, for function template we consume the
1014 // tokens and store them for late parsing at the end of the translation unit.
1015 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1016 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1017 Actions.canDelayFunctionBody(D)) {
1018 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1020 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1021 Scope *ParentScope = getCurScope()->getParent();
1023 D.setFunctionDefinitionKind(FDK_Definition);
1024 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1025 TemplateParameterLists);
1027 D.getMutableDeclSpec().abort();
1030 LexTemplateFunctionForLateParsing(Toks);
1033 FunctionDecl *FnD = DP->getAsFunction();
1034 Actions.CheckForFunctionRedefinition(FnD);
1035 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1039 else if (CurParsedObjCImpl &&
1040 !TemplateInfo.TemplateParams &&
1041 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1042 Tok.is(tok::colon)) &&
1043 Actions.CurContext->isTranslationUnit()) {
1044 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1045 Scope *ParentScope = getCurScope()->getParent();
1047 D.setFunctionDefinitionKind(FDK_Definition);
1048 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1049 MultiTemplateParamsArg());
1050 D.complete(FuncDecl);
1051 D.getMutableDeclSpec().abort();
1053 // Consume the tokens and store them for later parsing.
1054 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1055 CurParsedObjCImpl->HasCFunction = true;
1058 // FIXME: Should we really fall through here?
1061 // Enter a scope for the function body.
1062 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
1064 // Tell the actions module that we have entered a function definition with the
1065 // specified Declarator for the function.
1066 Decl *Res = TemplateInfo.TemplateParams?
1067 Actions.ActOnStartOfFunctionTemplateDef(getCurScope(),
1068 *TemplateInfo.TemplateParams, D)
1069 : Actions.ActOnStartOfFunctionDef(getCurScope(), D);
1071 // Break out of the ParsingDeclarator context before we parse the body.
1074 // Break out of the ParsingDeclSpec context, too. This const_cast is
1075 // safe because we're always the sole owner.
1076 D.getMutableDeclSpec().abort();
1078 if (TryConsumeToken(tok::equal)) {
1079 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1081 bool Delete = false;
1082 SourceLocation KWLoc;
1083 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1084 Diag(KWLoc, getLangOpts().CPlusPlus11
1085 ? diag::warn_cxx98_compat_deleted_function
1086 : diag::ext_deleted_function);
1087 Actions.SetDeclDeleted(Res, KWLoc);
1089 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1090 Diag(KWLoc, getLangOpts().CPlusPlus11
1091 ? diag::warn_cxx98_compat_defaulted_function
1092 : diag::ext_defaulted_function);
1093 Actions.SetDeclDefaulted(Res, KWLoc);
1095 llvm_unreachable("function definition after = not 'delete' or 'default'");
1098 if (Tok.is(tok::comma)) {
1099 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1101 SkipUntil(tok::semi);
1102 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1103 Delete ? "delete" : "default")) {
1104 SkipUntil(tok::semi);
1107 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1108 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1112 if (Tok.is(tok::kw_try))
1113 return ParseFunctionTryBlock(Res, BodyScope);
1115 // If we have a colon, then we're probably parsing a C++
1116 // ctor-initializer.
1117 if (Tok.is(tok::colon)) {
1118 ParseConstructorInitializer(Res);
1120 // Recover from error.
1121 if (!Tok.is(tok::l_brace)) {
1123 Actions.ActOnFinishFunctionBody(Res, nullptr);
1127 Actions.ActOnDefaultCtorInitializers(Res);
1129 // Late attributes are parsed in the same scope as the function body.
1130 if (LateParsedAttrs)
1131 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1133 return ParseFunctionStatementBody(Res, BodyScope);
1136 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1137 /// types for a function with a K&R-style identifier list for arguments.
1138 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1139 // We know that the top-level of this declarator is a function.
1140 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1142 // Enter function-declaration scope, limiting any declarators to the
1143 // function prototype scope, including parameter declarators.
1144 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1145 Scope::FunctionDeclarationScope | Scope::DeclScope);
1147 // Read all the argument declarations.
1148 while (isDeclarationSpecifier()) {
1149 SourceLocation DSStart = Tok.getLocation();
1151 // Parse the common declaration-specifiers piece.
1152 DeclSpec DS(AttrFactory);
1153 ParseDeclarationSpecifiers(DS);
1155 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1156 // least one declarator'.
1157 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1158 // the declarations though. It's trivial to ignore them, really hard to do
1159 // anything else with them.
1160 if (TryConsumeToken(tok::semi)) {
1161 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1165 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1167 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1168 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1169 Diag(DS.getStorageClassSpecLoc(),
1170 diag::err_invalid_storage_class_in_func_decl);
1171 DS.ClearStorageClassSpecs();
1173 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1174 Diag(DS.getThreadStorageClassSpecLoc(),
1175 diag::err_invalid_storage_class_in_func_decl);
1176 DS.ClearStorageClassSpecs();
1179 // Parse the first declarator attached to this declspec.
1180 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
1181 ParseDeclarator(ParmDeclarator);
1183 // Handle the full declarator list.
1185 // If attributes are present, parse them.
1186 MaybeParseGNUAttributes(ParmDeclarator);
1188 // Ask the actions module to compute the type for this declarator.
1190 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1193 // A missing identifier has already been diagnosed.
1194 ParmDeclarator.getIdentifier()) {
1196 // Scan the argument list looking for the correct param to apply this
1198 for (unsigned i = 0; ; ++i) {
1199 // C99 6.9.1p6: those declarators shall declare only identifiers from
1200 // the identifier list.
1201 if (i == FTI.NumParams) {
1202 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1203 << ParmDeclarator.getIdentifier();
1207 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1208 // Reject redefinitions of parameters.
1209 if (FTI.Params[i].Param) {
1210 Diag(ParmDeclarator.getIdentifierLoc(),
1211 diag::err_param_redefinition)
1212 << ParmDeclarator.getIdentifier();
1214 FTI.Params[i].Param = Param;
1221 // If we don't have a comma, it is either the end of the list (a ';') or
1222 // an error, bail out.
1223 if (Tok.isNot(tok::comma))
1226 ParmDeclarator.clear();
1228 // Consume the comma.
1229 ParmDeclarator.setCommaLoc(ConsumeToken());
1231 // Parse the next declarator.
1232 ParseDeclarator(ParmDeclarator);
1235 // Consume ';' and continue parsing.
1236 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1239 // Otherwise recover by skipping to next semi or mandatory function body.
1240 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1242 TryConsumeToken(tok::semi);
1245 // The actions module must verify that all arguments were declared.
1246 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1250 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1251 /// allowed to be a wide string, and is not subject to character translation.
1253 /// [GNU] asm-string-literal:
1256 ExprResult Parser::ParseAsmStringLiteral() {
1257 if (!isTokenStringLiteral()) {
1258 Diag(Tok, diag::err_expected_string_literal)
1259 << /*Source='in...'*/0 << "'asm'";
1263 ExprResult AsmString(ParseStringLiteralExpression());
1264 if (!AsmString.isInvalid()) {
1265 const auto *SL = cast<StringLiteral>(AsmString.get());
1266 if (!SL->isAscii()) {
1267 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1269 << SL->getSourceRange();
1278 /// [GNU] simple-asm-expr:
1279 /// 'asm' '(' asm-string-literal ')'
1281 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1282 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1283 SourceLocation Loc = ConsumeToken();
1285 if (Tok.is(tok::kw_volatile)) {
1286 // Remove from the end of 'asm' to the end of 'volatile'.
1287 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1288 PP.getLocForEndOfToken(Tok.getLocation()));
1290 Diag(Tok, diag::warn_file_asm_volatile)
1291 << FixItHint::CreateRemoval(RemovalRange);
1295 BalancedDelimiterTracker T(*this, tok::l_paren);
1296 if (T.consumeOpen()) {
1297 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1301 ExprResult Result(ParseAsmStringLiteral());
1303 if (!Result.isInvalid()) {
1304 // Close the paren and get the location of the end bracket
1307 *EndLoc = T.getCloseLocation();
1308 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1310 *EndLoc = Tok.getLocation();
1317 /// \brief Get the TemplateIdAnnotation from the token and put it in the
1318 /// cleanup pool so that it gets destroyed when parsing the current top level
1319 /// declaration is finished.
1320 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1321 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1322 TemplateIdAnnotation *
1323 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1327 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1328 // Push the current token back into the token stream (or revert it if it is
1329 // cached) and use an annotation scope token for current token.
1330 if (PP.isBacktrackEnabled())
1331 PP.RevertCachedTokens(1);
1334 Tok.setKind(tok::annot_cxxscope);
1335 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1336 Tok.setAnnotationRange(SS.getRange());
1338 // In case the tokens were cached, have Preprocessor replace them
1339 // with the annotation token. We don't need to do this if we've
1340 // just reverted back to a prior state.
1341 if (IsNewAnnotation)
1342 PP.AnnotateCachedTokens(Tok);
1345 /// \brief Attempt to classify the name at the current token position. This may
1346 /// form a type, scope or primary expression annotation, or replace the token
1347 /// with a typo-corrected keyword. This is only appropriate when the current
1348 /// name must refer to an entity which has already been declared.
1350 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1351 /// and might possibly have a dependent nested name specifier.
1352 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1353 /// no typo correction will be performed.
1354 Parser::AnnotatedNameKind
1355 Parser::TryAnnotateName(bool IsAddressOfOperand,
1356 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1357 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1359 const bool EnteringContext = false;
1360 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1363 if (getLangOpts().CPlusPlus &&
1364 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1367 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1368 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, false, SS,
1369 !WasScopeAnnotation))
1371 return ANK_Unresolved;
1374 IdentifierInfo *Name = Tok.getIdentifierInfo();
1375 SourceLocation NameLoc = Tok.getLocation();
1377 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1378 // typo-correct to tentatively-declared identifiers.
1379 if (isTentativelyDeclared(Name)) {
1380 // Identifier has been tentatively declared, and thus cannot be resolved as
1381 // an expression. Fall back to annotating it as a type.
1382 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, false, SS,
1383 !WasScopeAnnotation))
1385 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1388 Token Next = NextToken();
1390 // Look up and classify the identifier. We don't perform any typo-correction
1391 // after a scope specifier, because in general we can't recover from typos
1392 // there (eg, after correcting 'A::tempalte B<X>::C' [sic], we would need to
1393 // jump back into scope specifier parsing).
1394 Sema::NameClassification Classification = Actions.ClassifyName(
1395 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1396 SS.isEmpty() ? std::move(CCC) : nullptr);
1398 switch (Classification.getKind()) {
1399 case Sema::NC_Error:
1402 case Sema::NC_Keyword:
1403 // The identifier was typo-corrected to a keyword.
1404 Tok.setIdentifierInfo(Name);
1405 Tok.setKind(Name->getTokenID());
1406 PP.TypoCorrectToken(Tok);
1407 if (SS.isNotEmpty())
1408 AnnotateScopeToken(SS, !WasScopeAnnotation);
1409 // We've "annotated" this as a keyword.
1412 case Sema::NC_Unknown:
1413 // It's not something we know about. Leave it unannotated.
1417 Tok.setKind(tok::annot_typename);
1418 setTypeAnnotation(Tok, Classification.getType());
1419 Tok.setAnnotationEndLoc(NameLoc);
1420 if (SS.isNotEmpty())
1421 Tok.setLocation(SS.getBeginLoc());
1422 PP.AnnotateCachedTokens(Tok);
1425 case Sema::NC_Expression:
1426 Tok.setKind(tok::annot_primary_expr);
1427 setExprAnnotation(Tok, Classification.getExpression());
1428 Tok.setAnnotationEndLoc(NameLoc);
1429 if (SS.isNotEmpty())
1430 Tok.setLocation(SS.getBeginLoc());
1431 PP.AnnotateCachedTokens(Tok);
1434 case Sema::NC_TypeTemplate:
1435 if (Next.isNot(tok::less)) {
1436 // This may be a type template being used as a template template argument.
1437 if (SS.isNotEmpty())
1438 AnnotateScopeToken(SS, !WasScopeAnnotation);
1439 return ANK_TemplateName;
1442 case Sema::NC_VarTemplate:
1443 case Sema::NC_FunctionTemplate: {
1444 // We have a type, variable or function template followed by '<'.
1447 Id.setIdentifier(Name, NameLoc);
1448 if (AnnotateTemplateIdToken(
1449 TemplateTy::make(Classification.getTemplateName()),
1450 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1455 case Sema::NC_NestedNameSpecifier:
1456 llvm_unreachable("already parsed nested name specifier");
1459 // Unable to classify the name, but maybe we can annotate a scope specifier.
1460 if (SS.isNotEmpty())
1461 AnnotateScopeToken(SS, !WasScopeAnnotation);
1462 return ANK_Unresolved;
1465 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1466 assert(Tok.isNot(tok::identifier));
1467 Diag(Tok, diag::ext_keyword_as_ident)
1468 << PP.getSpelling(Tok)
1471 Tok.getIdentifierInfo()->RevertTokenIDToIdentifier();
1472 Tok.setKind(tok::identifier);
1476 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1477 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1478 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1479 /// with a single annotation token representing the typename or C++ scope
1481 /// This simplifies handling of C++ scope specifiers and allows efficient
1482 /// backtracking without the need to re-parse and resolve nested-names and
1484 /// It will mainly be called when we expect to treat identifiers as typenames
1485 /// (if they are typenames). For example, in C we do not expect identifiers
1486 /// inside expressions to be treated as typenames so it will not be called
1487 /// for expressions in C.
1488 /// The benefit for C/ObjC is that a typename will be annotated and
1489 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1490 /// will not be called twice, once to check whether we have a declaration
1491 /// specifier, and another one to get the actual type inside
1492 /// ParseDeclarationSpecifiers).
1494 /// This returns true if an error occurred.
1496 /// Note that this routine emits an error if you call it with ::new or ::delete
1497 /// as the current tokens, so only call it in contexts where these are invalid.
1498 bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext, bool NeedType) {
1499 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1500 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1501 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1502 Tok.is(tok::kw___super)) &&
1503 "Cannot be a type or scope token!");
1505 if (Tok.is(tok::kw_typename)) {
1506 // MSVC lets you do stuff like:
1507 // typename typedef T_::D D;
1509 // We will consume the typedef token here and put it back after we have
1510 // parsed the first identifier, transforming it into something more like:
1511 // typename T_::D typedef D;
1512 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1514 PP.Lex(TypedefToken);
1515 bool Result = TryAnnotateTypeOrScopeToken(EnteringContext, NeedType);
1519 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1523 // Parse a C++ typename-specifier, e.g., "typename T::type".
1525 // typename-specifier:
1526 // 'typename' '::' [opt] nested-name-specifier identifier
1527 // 'typename' '::' [opt] nested-name-specifier template [opt]
1528 // simple-template-id
1529 SourceLocation TypenameLoc = ConsumeToken();
1531 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/ParsedType(),
1532 /*EnteringContext=*/false,
1533 nullptr, /*IsTypename*/ true))
1536 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1537 Tok.is(tok::annot_decltype)) {
1538 // Attempt to recover by skipping the invalid 'typename'
1539 if (Tok.is(tok::annot_decltype) ||
1540 (!TryAnnotateTypeOrScopeToken(EnteringContext, NeedType) &&
1541 Tok.isAnnotation())) {
1542 unsigned DiagID = diag::err_expected_qualified_after_typename;
1543 // MS compatibility: MSVC permits using known types with typename.
1544 // e.g. "typedef typename T* pointer_type"
1545 if (getLangOpts().MicrosoftExt)
1546 DiagID = diag::warn_expected_qualified_after_typename;
1547 Diag(Tok.getLocation(), DiagID);
1552 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1557 if (Tok.is(tok::identifier)) {
1558 // FIXME: check whether the next token is '<', first!
1559 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1560 *Tok.getIdentifierInfo(),
1562 } else if (Tok.is(tok::annot_template_id)) {
1563 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1564 if (TemplateId->Kind != TNK_Type_template &&
1565 TemplateId->Kind != TNK_Dependent_template_name) {
1566 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1567 << Tok.getAnnotationRange();
1571 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1572 TemplateId->NumArgs);
1574 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1575 TemplateId->TemplateKWLoc,
1576 TemplateId->Template,
1577 TemplateId->TemplateNameLoc,
1578 TemplateId->LAngleLoc,
1580 TemplateId->RAngleLoc);
1582 Diag(Tok, diag::err_expected_type_name_after_typename)
1587 SourceLocation EndLoc = Tok.getLastLoc();
1588 Tok.setKind(tok::annot_typename);
1589 setTypeAnnotation(Tok, Ty.isInvalid() ? ParsedType() : Ty.get());
1590 Tok.setAnnotationEndLoc(EndLoc);
1591 Tok.setLocation(TypenameLoc);
1592 PP.AnnotateCachedTokens(Tok);
1596 // Remembers whether the token was originally a scope annotation.
1597 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1600 if (getLangOpts().CPlusPlus)
1601 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1604 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(EnteringContext, NeedType,
1605 SS, !WasScopeAnnotation);
1608 /// \brief Try to annotate a type or scope token, having already parsed an
1609 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1610 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1611 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(bool EnteringContext,
1615 if (Tok.is(tok::identifier)) {
1616 IdentifierInfo *CorrectedII = nullptr;
1617 // Determine whether the identifier is a type name.
1618 if (ParsedType Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
1619 Tok.getLocation(), getCurScope(),
1621 NextToken().is(tok::period),
1623 /*IsCtorOrDtorName=*/false,
1624 /*NonTrivialTypeSourceInfo*/ true,
1625 NeedType ? &CorrectedII
1627 // A FixIt was applied as a result of typo correction
1629 Tok.setIdentifierInfo(CorrectedII);
1630 // This is a typename. Replace the current token in-place with an
1631 // annotation type token.
1632 Tok.setKind(tok::annot_typename);
1633 setTypeAnnotation(Tok, Ty);
1634 Tok.setAnnotationEndLoc(Tok.getLocation());
1635 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1636 Tok.setLocation(SS.getBeginLoc());
1638 // In case the tokens were cached, have Preprocessor replace
1639 // them with the annotation token.
1640 PP.AnnotateCachedTokens(Tok);
1644 if (!getLangOpts().CPlusPlus) {
1645 // If we're in C, we can't have :: tokens at all (the lexer won't return
1646 // them). If the identifier is not a type, then it can't be scope either,
1651 // If this is a template-id, annotate with a template-id or type token.
1652 if (NextToken().is(tok::less)) {
1653 TemplateTy Template;
1654 UnqualifiedId TemplateName;
1655 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1656 bool MemberOfUnknownSpecialization;
1657 if (TemplateNameKind TNK
1658 = Actions.isTemplateName(getCurScope(), SS,
1659 /*hasTemplateKeyword=*/false, TemplateName,
1660 /*ObjectType=*/ ParsedType(),
1662 Template, MemberOfUnknownSpecialization)) {
1663 // Consume the identifier.
1665 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1667 // If an unrecoverable error occurred, we need to return true here,
1668 // because the token stream is in a damaged state. We may not return
1669 // a valid identifier.
1675 // The current token, which is either an identifier or a
1676 // template-id, is not part of the annotation. Fall through to
1677 // push that token back into the stream and complete the C++ scope
1678 // specifier annotation.
1681 if (Tok.is(tok::annot_template_id)) {
1682 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1683 if (TemplateId->Kind == TNK_Type_template) {
1684 // A template-id that refers to a type was parsed into a
1685 // template-id annotation in a context where we weren't allowed
1686 // to produce a type annotation token. Update the template-id
1687 // annotation token to a type annotation token now.
1688 AnnotateTemplateIdTokenAsType();
1696 // A C++ scope specifier that isn't followed by a typename.
1697 AnnotateScopeToken(SS, IsNewScope);
1701 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1702 /// annotates C++ scope specifiers and template-ids. This returns
1703 /// true if there was an error that could not be recovered from.
1705 /// Note that this routine emits an error if you call it with ::new or ::delete
1706 /// as the current tokens, so only call it in contexts where these are invalid.
1707 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1708 assert(getLangOpts().CPlusPlus &&
1709 "Call sites of this function should be guarded by checking for C++");
1710 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1711 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1712 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1713 "Cannot be a type or scope token!");
1716 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
1721 AnnotateScopeToken(SS, true);
1725 bool Parser::isTokenEqualOrEqualTypo() {
1726 tok::TokenKind Kind = Tok.getKind();
1730 case tok::ampequal: // &=
1731 case tok::starequal: // *=
1732 case tok::plusequal: // +=
1733 case tok::minusequal: // -=
1734 case tok::exclaimequal: // !=
1735 case tok::slashequal: // /=
1736 case tok::percentequal: // %=
1737 case tok::lessequal: // <=
1738 case tok::lesslessequal: // <<=
1739 case tok::greaterequal: // >=
1740 case tok::greatergreaterequal: // >>=
1741 case tok::caretequal: // ^=
1742 case tok::pipeequal: // |=
1743 case tok::equalequal: // ==
1744 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1746 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1752 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1753 assert(Tok.is(tok::code_completion));
1754 PrevTokLocation = Tok.getLocation();
1756 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1757 if (S->getFlags() & Scope::FnScope) {
1758 Actions.CodeCompleteOrdinaryName(getCurScope(),
1759 Sema::PCC_RecoveryInFunction);
1761 return PrevTokLocation;
1764 if (S->getFlags() & Scope::ClassScope) {
1765 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1767 return PrevTokLocation;
1771 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1773 return PrevTokLocation;
1776 // Code-completion pass-through functions
1778 void Parser::CodeCompleteDirective(bool InConditional) {
1779 Actions.CodeCompletePreprocessorDirective(InConditional);
1782 void Parser::CodeCompleteInConditionalExclusion() {
1783 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1786 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1787 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1790 void Parser::CodeCompletePreprocessorExpression() {
1791 Actions.CodeCompletePreprocessorExpression();
1794 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1795 MacroInfo *MacroInfo,
1796 unsigned ArgumentIndex) {
1797 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1801 void Parser::CodeCompleteNaturalLanguage() {
1802 Actions.CodeCompleteNaturalLanguage();
1805 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1806 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1807 "Expected '__if_exists' or '__if_not_exists'");
1808 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1809 Result.KeywordLoc = ConsumeToken();
1811 BalancedDelimiterTracker T(*this, tok::l_paren);
1812 if (T.consumeOpen()) {
1813 Diag(Tok, diag::err_expected_lparen_after)
1814 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1818 // Parse nested-name-specifier.
1819 if (getLangOpts().CPlusPlus)
1820 ParseOptionalCXXScopeSpecifier(Result.SS, ParsedType(),
1821 /*EnteringContext=*/false);
1823 // Check nested-name specifier.
1824 if (Result.SS.isInvalid()) {
1829 // Parse the unqualified-id.
1830 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
1831 if (ParseUnqualifiedId(Result.SS, false, true, true, ParsedType(),
1832 TemplateKWLoc, Result.Name)) {
1837 if (T.consumeClose())
1840 // Check if the symbol exists.
1841 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
1842 Result.IsIfExists, Result.SS,
1844 case Sema::IER_Exists:
1845 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
1848 case Sema::IER_DoesNotExist:
1849 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
1852 case Sema::IER_Dependent:
1853 Result.Behavior = IEB_Dependent;
1856 case Sema::IER_Error:
1863 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
1864 IfExistsCondition Result;
1865 if (ParseMicrosoftIfExistsCondition(Result))
1868 BalancedDelimiterTracker Braces(*this, tok::l_brace);
1869 if (Braces.consumeOpen()) {
1870 Diag(Tok, diag::err_expected) << tok::l_brace;
1874 switch (Result.Behavior) {
1876 // Parse declarations below.
1880 llvm_unreachable("Cannot have a dependent external declaration");
1887 // Parse the declarations.
1888 // FIXME: Support module import within __if_exists?
1889 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
1890 ParsedAttributesWithRange attrs(AttrFactory);
1891 MaybeParseCXX11Attributes(attrs);
1892 MaybeParseMicrosoftAttributes(attrs);
1893 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
1894 if (Result && !getCurScope()->getParent())
1895 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
1897 Braces.consumeClose();
1900 Parser::DeclGroupPtrTy Parser::ParseModuleImport(SourceLocation AtLoc) {
1901 assert(Tok.isObjCAtKeyword(tok::objc_import) &&
1902 "Improper start to module import");
1903 SourceLocation ImportLoc = ConsumeToken();
1905 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1907 // Parse the module path.
1909 if (!Tok.is(tok::identifier)) {
1910 if (Tok.is(tok::code_completion)) {
1911 Actions.CodeCompleteModuleImport(ImportLoc, Path);
1913 return DeclGroupPtrTy();
1916 Diag(Tok, diag::err_module_expected_ident);
1917 SkipUntil(tok::semi);
1918 return DeclGroupPtrTy();
1921 // Record this part of the module path.
1922 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
1925 if (Tok.is(tok::period)) {
1933 if (PP.hadModuleLoaderFatalFailure()) {
1934 // With a fatal failure in the module loader, we abort parsing.
1936 return DeclGroupPtrTy();
1939 DeclResult Import = Actions.ActOnModuleImport(AtLoc, ImportLoc, Path);
1940 ExpectAndConsumeSemi(diag::err_module_expected_semi);
1941 if (Import.isInvalid())
1942 return DeclGroupPtrTy();
1944 return Actions.ConvertDeclToDeclGroup(Import.get());
1947 bool BalancedDelimiterTracker::diagnoseOverflow() {
1948 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
1949 << P.getLangOpts().BracketDepth;
1950 P.Diag(P.Tok, diag::note_bracket_depth);
1955 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
1957 tok::TokenKind SkipToTok) {
1958 LOpen = P.Tok.getLocation();
1959 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
1960 if (SkipToTok != tok::unknown)
1961 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
1965 if (getDepth() < MaxDepth)
1968 return diagnoseOverflow();
1971 bool BalancedDelimiterTracker::diagnoseMissingClose() {
1972 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
1974 P.Diag(P.Tok, diag::err_expected) << Close;
1975 P.Diag(LOpen, diag::note_matching) << Kind;
1977 // If we're not already at some kind of closing bracket, skip to our closing
1979 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
1980 P.Tok.isNot(tok::r_square) &&
1981 P.SkipUntil(Close, FinalToken,
1982 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
1984 LClose = P.ConsumeAnyToken();
1988 void BalancedDelimiterTracker::skipToEnd() {
1989 P.SkipUntil(Close, Parser::StopBeforeMatch);