1 //===--- ParseExprCXX.cpp - C++ Expression Parsing ------------------------===//
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 Expression parsing implementation for C++.
12 //===----------------------------------------------------------------------===//
13 #include "clang/AST/ASTContext.h"
14 #include "RAIIObjectsForParser.h"
15 #include "clang/AST/DeclTemplate.h"
16 #include "clang/Basic/PrettyStackTrace.h"
17 #include "clang/Lex/LiteralSupport.h"
18 #include "clang/Parse/ParseDiagnostic.h"
19 #include "clang/Parse/Parser.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/ParsedTemplate.h"
22 #include "clang/Sema/Scope.h"
23 #include "llvm/Support/ErrorHandling.h"
26 using namespace clang;
28 static int SelectDigraphErrorMessage(tok::TokenKind Kind) {
31 case tok::unknown: return 0;
33 case tok::kw_const_cast: return 1;
34 case tok::kw_dynamic_cast: return 2;
35 case tok::kw_reinterpret_cast: return 3;
36 case tok::kw_static_cast: return 4;
38 llvm_unreachable("Unknown type for digraph error message.");
42 // Are the two tokens adjacent in the same source file?
43 bool Parser::areTokensAdjacent(const Token &First, const Token &Second) {
44 SourceManager &SM = PP.getSourceManager();
45 SourceLocation FirstLoc = SM.getSpellingLoc(First.getLocation());
46 SourceLocation FirstEnd = FirstLoc.getLocWithOffset(First.getLength());
47 return FirstEnd == SM.getSpellingLoc(Second.getLocation());
50 // Suggest fixit for "<::" after a cast.
51 static void FixDigraph(Parser &P, Preprocessor &PP, Token &DigraphToken,
52 Token &ColonToken, tok::TokenKind Kind, bool AtDigraph) {
53 // Pull '<:' and ':' off token stream.
59 Range.setBegin(DigraphToken.getLocation());
60 Range.setEnd(ColonToken.getLocation());
61 P.Diag(DigraphToken.getLocation(), diag::err_missing_whitespace_digraph)
62 << SelectDigraphErrorMessage(Kind)
63 << FixItHint::CreateReplacement(Range, "< ::");
65 // Update token information to reflect their change in token type.
66 ColonToken.setKind(tok::coloncolon);
67 ColonToken.setLocation(ColonToken.getLocation().getLocWithOffset(-1));
68 ColonToken.setLength(2);
69 DigraphToken.setKind(tok::less);
70 DigraphToken.setLength(1);
72 // Push new tokens back to token stream.
73 PP.EnterToken(ColonToken);
75 PP.EnterToken(DigraphToken);
78 // Check for '<::' which should be '< ::' instead of '[:' when following
80 void Parser::CheckForTemplateAndDigraph(Token &Next, ParsedType ObjectType,
82 IdentifierInfo &II, CXXScopeSpec &SS) {
83 if (!Next.is(tok::l_square) || Next.getLength() != 2)
86 Token SecondToken = GetLookAheadToken(2);
87 if (!SecondToken.is(tok::colon) || !areTokensAdjacent(Next, SecondToken))
91 UnqualifiedId TemplateName;
92 TemplateName.setIdentifier(&II, Tok.getLocation());
93 bool MemberOfUnknownSpecialization;
94 if (!Actions.isTemplateName(getCurScope(), SS, /*hasTemplateKeyword=*/false,
95 TemplateName, ObjectType, EnteringContext,
96 Template, MemberOfUnknownSpecialization))
99 FixDigraph(*this, PP, Next, SecondToken, tok::unknown,
103 /// \brief Emits an error for a left parentheses after a double colon.
105 /// When a '(' is found after a '::', emit an error. Attempt to fix the token
106 /// stream by removing the '(', and the matching ')' if found.
107 void Parser::CheckForLParenAfterColonColon() {
108 if (!Tok.is(tok::l_paren))
112 Token NextTok = GetLookAheadToken(1);
113 Token StarTok = NextTok;
114 // Check for (identifier or (*identifier
115 Token IdentifierTok = StarTok.is(tok::star) ? GetLookAheadToken(2) : StarTok;
116 if (IdentifierTok.isNot(tok::identifier))
121 RParen.setLocation(SourceLocation());
122 // Do we have a ')' ?
123 NextTok = StarTok.is(tok::star) ? GetLookAheadToken(2) : GetLookAheadToken(1);
124 if (NextTok.is(tok::r_paren)) {
126 // Eat the '*' if it is present.
127 if (StarTok.is(tok::star))
129 // Eat the identifier.
131 // Add the identifier token back.
132 PP.EnterToken(IdentifierTok);
133 // Add the '*' back if it was present.
134 if (StarTok.is(tok::star))
135 PP.EnterToken(StarTok);
140 Diag(LParen.getLocation(), diag::err_paren_after_colon_colon)
141 << FixItHint::CreateRemoval(LParen.getLocation())
142 << FixItHint::CreateRemoval(RParen.getLocation());
145 /// \brief Parse global scope or nested-name-specifier if present.
147 /// Parses a C++ global scope specifier ('::') or nested-name-specifier (which
148 /// may be preceded by '::'). Note that this routine will not parse ::new or
149 /// ::delete; it will just leave them in the token stream.
151 /// '::'[opt] nested-name-specifier
154 /// nested-name-specifier:
156 /// namespace-name '::'
157 /// nested-name-specifier identifier '::'
158 /// nested-name-specifier 'template'[opt] simple-template-id '::'
161 /// \param SS the scope specifier that will be set to the parsed
162 /// nested-name-specifier (or empty)
164 /// \param ObjectType if this nested-name-specifier is being parsed following
165 /// the "." or "->" of a member access expression, this parameter provides the
166 /// type of the object whose members are being accessed.
168 /// \param EnteringContext whether we will be entering into the context of
169 /// the nested-name-specifier after parsing it.
171 /// \param MayBePseudoDestructor When non-NULL, points to a flag that
172 /// indicates whether this nested-name-specifier may be part of a
173 /// pseudo-destructor name. In this case, the flag will be set false
174 /// if we don't actually end up parsing a destructor name. Moreorover,
175 /// if we do end up determining that we are parsing a destructor name,
176 /// the last component of the nested-name-specifier is not parsed as
177 /// part of the scope specifier.
179 /// \param IsTypename If \c true, this nested-name-specifier is known to be
180 /// part of a type name. This is used to improve error recovery.
182 /// \param LastII When non-NULL, points to an IdentifierInfo* that will be
183 /// filled in with the leading identifier in the last component of the
184 /// nested-name-specifier, if any.
186 /// \returns true if there was an error parsing a scope specifier
187 bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS,
188 ParsedType ObjectType,
189 bool EnteringContext,
190 bool *MayBePseudoDestructor,
192 IdentifierInfo **LastII) {
193 assert(getLangOpts().CPlusPlus &&
194 "Call sites of this function should be guarded by checking for C++");
196 if (Tok.is(tok::annot_cxxscope)) {
197 assert(!LastII && "want last identifier but have already annotated scope");
198 assert(!MayBePseudoDestructor && "unexpected annot_cxxscope");
199 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(),
200 Tok.getAnnotationRange(),
206 if (Tok.is(tok::annot_template_id)) {
207 // If the current token is an annotated template id, it may already have
208 // a scope specifier. Restore it.
209 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
213 // Has to happen before any "return false"s in this function.
214 bool CheckForDestructor = false;
215 if (MayBePseudoDestructor && *MayBePseudoDestructor) {
216 CheckForDestructor = true;
217 *MayBePseudoDestructor = false;
223 bool HasScopeSpecifier = false;
225 if (Tok.is(tok::coloncolon)) {
226 // ::new and ::delete aren't nested-name-specifiers.
227 tok::TokenKind NextKind = NextToken().getKind();
228 if (NextKind == tok::kw_new || NextKind == tok::kw_delete)
231 if (NextKind == tok::l_brace) {
232 // It is invalid to have :: {, consume the scope qualifier and pretend
233 // like we never saw it.
234 Diag(ConsumeToken(), diag::err_expected) << tok::identifier;
236 // '::' - Global scope qualifier.
237 if (Actions.ActOnCXXGlobalScopeSpecifier(ConsumeToken(), SS))
240 CheckForLParenAfterColonColon();
242 HasScopeSpecifier = true;
246 if (Tok.is(tok::kw___super)) {
247 SourceLocation SuperLoc = ConsumeToken();
248 if (!Tok.is(tok::coloncolon)) {
249 Diag(Tok.getLocation(), diag::err_expected_coloncolon_after_super);
253 return Actions.ActOnSuperScopeSpecifier(SuperLoc, ConsumeToken(), SS);
256 if (!HasScopeSpecifier &&
257 Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)) {
258 DeclSpec DS(AttrFactory);
259 SourceLocation DeclLoc = Tok.getLocation();
260 SourceLocation EndLoc = ParseDecltypeSpecifier(DS);
262 SourceLocation CCLoc;
263 if (!TryConsumeToken(tok::coloncolon, CCLoc)) {
264 AnnotateExistingDecltypeSpecifier(DS, DeclLoc, EndLoc);
268 if (Actions.ActOnCXXNestedNameSpecifierDecltype(SS, DS, CCLoc))
269 SS.SetInvalid(SourceRange(DeclLoc, CCLoc));
271 HasScopeSpecifier = true;
275 if (HasScopeSpecifier) {
276 // C++ [basic.lookup.classref]p5:
277 // If the qualified-id has the form
279 // ::class-name-or-namespace-name::...
281 // the class-name-or-namespace-name is looked up in global scope as a
282 // class-name or namespace-name.
284 // To implement this, we clear out the object type as soon as we've
285 // seen a leading '::' or part of a nested-name-specifier.
286 ObjectType = ParsedType();
288 if (Tok.is(tok::code_completion)) {
289 // Code completion for a nested-name-specifier, where the code
290 // code completion token follows the '::'.
291 Actions.CodeCompleteQualifiedId(getCurScope(), SS, EnteringContext);
292 // Include code completion token into the range of the scope otherwise
293 // when we try to annotate the scope tokens the dangling code completion
294 // token will cause assertion in
295 // Preprocessor::AnnotatePreviousCachedTokens.
296 SS.setEndLoc(Tok.getLocation());
302 // nested-name-specifier:
303 // nested-name-specifier 'template'[opt] simple-template-id '::'
305 // Parse the optional 'template' keyword, then make sure we have
306 // 'identifier <' after it.
307 if (Tok.is(tok::kw_template)) {
308 // If we don't have a scope specifier or an object type, this isn't a
309 // nested-name-specifier, since they aren't allowed to start with
311 if (!HasScopeSpecifier && !ObjectType)
314 TentativeParsingAction TPA(*this);
315 SourceLocation TemplateKWLoc = ConsumeToken();
317 UnqualifiedId TemplateName;
318 if (Tok.is(tok::identifier)) {
319 // Consume the identifier.
320 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
322 } else if (Tok.is(tok::kw_operator)) {
323 // We don't need to actually parse the unqualified-id in this case,
324 // because a simple-template-id cannot start with 'operator', but
325 // go ahead and parse it anyway for consistency with the case where
326 // we already annotated the template-id.
327 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType,
333 if (TemplateName.getKind() != UnqualifiedId::IK_OperatorFunctionId &&
334 TemplateName.getKind() != UnqualifiedId::IK_LiteralOperatorId) {
335 Diag(TemplateName.getSourceRange().getBegin(),
336 diag::err_id_after_template_in_nested_name_spec)
337 << TemplateName.getSourceRange();
346 // If the next token is not '<', we have a qualified-id that refers
347 // to a template name, such as T::template apply, but is not a
349 if (Tok.isNot(tok::less)) {
354 // Commit to parsing the template-id.
357 if (TemplateNameKind TNK
358 = Actions.ActOnDependentTemplateName(getCurScope(),
359 SS, TemplateKWLoc, TemplateName,
360 ObjectType, EnteringContext,
362 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateKWLoc,
363 TemplateName, false))
371 if (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) {
376 // So we need to check whether the template-id is a simple-template-id of
377 // the right kind (it should name a type or be dependent), and then
378 // convert it into a type within the nested-name-specifier.
379 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
380 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde)) {
381 *MayBePseudoDestructor = true;
386 *LastII = TemplateId->Name;
388 // Consume the template-id token.
391 assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!");
392 SourceLocation CCLoc = ConsumeToken();
394 HasScopeSpecifier = true;
396 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
397 TemplateId->NumArgs);
399 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(),
401 TemplateId->TemplateKWLoc,
402 TemplateId->Template,
403 TemplateId->TemplateNameLoc,
404 TemplateId->LAngleLoc,
406 TemplateId->RAngleLoc,
409 SourceLocation StartLoc
410 = SS.getBeginLoc().isValid()? SS.getBeginLoc()
411 : TemplateId->TemplateNameLoc;
412 SS.SetInvalid(SourceRange(StartLoc, CCLoc));
418 // The rest of the nested-name-specifier possibilities start with
420 if (Tok.isNot(tok::identifier))
423 IdentifierInfo &II = *Tok.getIdentifierInfo();
425 // nested-name-specifier:
427 // namespace-name '::'
428 // nested-name-specifier identifier '::'
429 Token Next = NextToken();
431 // If we get foo:bar, this is almost certainly a typo for foo::bar. Recover
432 // and emit a fixit hint for it.
433 if (Next.is(tok::colon) && !ColonIsSacred) {
434 if (Actions.IsInvalidUnlessNestedName(getCurScope(), SS, II,
436 Next.getLocation(), ObjectType,
438 // If the token after the colon isn't an identifier, it's still an
439 // error, but they probably meant something else strange so don't
440 // recover like this.
441 PP.LookAhead(1).is(tok::identifier)) {
442 Diag(Next, diag::err_unexpected_colon_in_nested_name_spec)
443 << FixItHint::CreateReplacement(Next.getLocation(), "::");
444 // Recover as if the user wrote '::'.
445 Next.setKind(tok::coloncolon);
449 if (Next.is(tok::coloncolon) && GetLookAheadToken(2).is(tok::l_brace)) {
450 // It is invalid to have :: {, consume the scope qualifier and pretend
451 // like we never saw it.
452 Token Identifier = Tok; // Stash away the identifier.
453 ConsumeToken(); // Eat the identifier, current token is now '::'.
454 Diag(PP.getLocForEndOfToken(ConsumeToken()), diag::err_expected)
456 UnconsumeToken(Identifier); // Stick the identifier back.
457 Next = NextToken(); // Point Next at the '{' token.
460 if (Next.is(tok::coloncolon)) {
461 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde) &&
462 !Actions.isNonTypeNestedNameSpecifier(
463 getCurScope(), SS, Tok.getLocation(), II, ObjectType)) {
464 *MayBePseudoDestructor = true;
469 const Token &Next2 = GetLookAheadToken(2);
470 if (Next2.is(tok::kw_private) || Next2.is(tok::kw_protected) ||
471 Next2.is(tok::kw_public) || Next2.is(tok::kw_virtual)) {
472 Diag(Next2, diag::err_unexpected_token_in_nested_name_spec)
474 << FixItHint::CreateReplacement(Next.getLocation(), ":");
477 ColonColon.setKind(tok::colon);
478 PP.EnterToken(ColonColon);
486 // We have an identifier followed by a '::'. Lookup this name
487 // as the name in a nested-name-specifier.
488 Token Identifier = Tok;
489 SourceLocation IdLoc = ConsumeToken();
490 assert(Tok.isOneOf(tok::coloncolon, tok::colon) &&
491 "NextToken() not working properly!");
492 Token ColonColon = Tok;
493 SourceLocation CCLoc = ConsumeToken();
495 CheckForLParenAfterColonColon();
497 bool IsCorrectedToColon = false;
498 bool *CorrectionFlagPtr = ColonIsSacred ? &IsCorrectedToColon : nullptr;
499 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), II, IdLoc, CCLoc,
500 ObjectType, EnteringContext, SS,
501 false, CorrectionFlagPtr)) {
502 // Identifier is not recognized as a nested name, but we can have
503 // mistyped '::' instead of ':'.
504 if (CorrectionFlagPtr && IsCorrectedToColon) {
505 ColonColon.setKind(tok::colon);
507 PP.EnterToken(ColonColon);
511 SS.SetInvalid(SourceRange(IdLoc, CCLoc));
513 HasScopeSpecifier = true;
517 CheckForTemplateAndDigraph(Next, ObjectType, EnteringContext, II, SS);
519 // nested-name-specifier:
521 if (Next.is(tok::less)) {
523 UnqualifiedId TemplateName;
524 TemplateName.setIdentifier(&II, Tok.getLocation());
525 bool MemberOfUnknownSpecialization;
526 if (TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
527 /*hasTemplateKeyword=*/false,
532 MemberOfUnknownSpecialization)) {
533 // We have found a template name, so annotate this token
534 // with a template-id annotation. We do not permit the
535 // template-id to be translated into a type annotation,
536 // because some clients (e.g., the parsing of class template
537 // specializations) still want to see the original template-id
540 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
541 TemplateName, false))
546 if (MemberOfUnknownSpecialization && (ObjectType || SS.isSet()) &&
547 (IsTypename || IsTemplateArgumentList(1))) {
548 // We have something like t::getAs<T>, where getAs is a
549 // member of an unknown specialization. However, this will only
550 // parse correctly as a template, so suggest the keyword 'template'
551 // before 'getAs' and treat this as a dependent template name.
552 unsigned DiagID = diag::err_missing_dependent_template_keyword;
553 if (getLangOpts().MicrosoftExt)
554 DiagID = diag::warn_missing_dependent_template_keyword;
556 Diag(Tok.getLocation(), DiagID)
558 << FixItHint::CreateInsertion(Tok.getLocation(), "template ");
560 if (TemplateNameKind TNK
561 = Actions.ActOnDependentTemplateName(getCurScope(),
562 SS, SourceLocation(),
563 TemplateName, ObjectType,
564 EnteringContext, Template)) {
565 // Consume the identifier.
567 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
568 TemplateName, false))
578 // We don't have any tokens that form the beginning of a
579 // nested-name-specifier, so we're done.
583 // Even if we didn't see any pieces of a nested-name-specifier, we
584 // still check whether there is a tilde in this position, which
585 // indicates a potential pseudo-destructor.
586 if (CheckForDestructor && Tok.is(tok::tilde))
587 *MayBePseudoDestructor = true;
592 ExprResult Parser::tryParseCXXIdExpression(CXXScopeSpec &SS, bool isAddressOfOperand,
593 Token &Replacement) {
594 SourceLocation TemplateKWLoc;
596 if (ParseUnqualifiedId(SS,
597 /*EnteringContext=*/false,
598 /*AllowDestructorName=*/false,
599 /*AllowConstructorName=*/false,
600 /*ObjectType=*/ParsedType(), TemplateKWLoc, Name))
603 // This is only the direct operand of an & operator if it is not
604 // followed by a postfix-expression suffix.
605 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
606 isAddressOfOperand = false;
608 return Actions.ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Name,
609 Tok.is(tok::l_paren), isAddressOfOperand,
610 nullptr, /*IsInlineAsmIdentifier=*/false,
614 /// ParseCXXIdExpression - Handle id-expression.
621 /// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
623 /// '::' operator-function-id
626 /// NOTE: The standard specifies that, for qualified-id, the parser does not
629 /// '::' conversion-function-id
630 /// '::' '~' class-name
632 /// This may cause a slight inconsistency on diagnostics:
637 /// :: A :: ~ C(); // Some Sema error about using destructor with a
639 /// :: ~ C(); // Some Parser error like 'unexpected ~'.
642 /// We simplify the parser a bit and make it work like:
645 /// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
646 /// '::' unqualified-id
648 /// That way Sema can handle and report similar errors for namespaces and the
651 /// The isAddressOfOperand parameter indicates that this id-expression is a
652 /// direct operand of the address-of operator. This is, besides member contexts,
653 /// the only place where a qualified-id naming a non-static class member may
656 ExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) {
658 // '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
659 // '::' unqualified-id
662 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false);
666 tryParseCXXIdExpression(SS, isAddressOfOperand, Replacement);
667 if (Result.isUnset()) {
668 // If the ExprResult is valid but null, then typo correction suggested a
669 // keyword replacement that needs to be reparsed.
670 UnconsumeToken(Replacement);
671 Result = tryParseCXXIdExpression(SS, isAddressOfOperand, Replacement);
673 assert(!Result.isUnset() && "Typo correction suggested a keyword replacement "
674 "for a previous keyword suggestion");
678 /// ParseLambdaExpression - Parse a C++11 lambda expression.
680 /// lambda-expression:
681 /// lambda-introducer lambda-declarator[opt] compound-statement
683 /// lambda-introducer:
684 /// '[' lambda-capture[opt] ']'
689 /// capture-default ',' capture-list
697 /// capture-list ',' capture
701 /// init-capture [C++1y]
708 /// init-capture: [C++1y]
709 /// identifier initializer
710 /// '&' identifier initializer
712 /// lambda-declarator:
713 /// '(' parameter-declaration-clause ')' attribute-specifier[opt]
714 /// 'mutable'[opt] exception-specification[opt]
715 /// trailing-return-type[opt]
717 ExprResult Parser::ParseLambdaExpression() {
718 // Parse lambda-introducer.
719 LambdaIntroducer Intro;
720 Optional<unsigned> DiagID = ParseLambdaIntroducer(Intro);
722 Diag(Tok, DiagID.getValue());
723 SkipUntil(tok::r_square, StopAtSemi);
724 SkipUntil(tok::l_brace, StopAtSemi);
725 SkipUntil(tok::r_brace, StopAtSemi);
729 return ParseLambdaExpressionAfterIntroducer(Intro);
732 /// TryParseLambdaExpression - Use lookahead and potentially tentative
733 /// parsing to determine if we are looking at a C++0x lambda expression, and parse
736 /// If we are not looking at a lambda expression, returns ExprError().
737 ExprResult Parser::TryParseLambdaExpression() {
738 assert(getLangOpts().CPlusPlus11
739 && Tok.is(tok::l_square)
740 && "Not at the start of a possible lambda expression.");
742 const Token Next = NextToken(), After = GetLookAheadToken(2);
744 // If lookahead indicates this is a lambda...
745 if (Next.is(tok::r_square) || // []
746 Next.is(tok::equal) || // [=
747 (Next.is(tok::amp) && // [&] or [&,
748 (After.is(tok::r_square) ||
749 After.is(tok::comma))) ||
750 (Next.is(tok::identifier) && // [identifier]
751 After.is(tok::r_square))) {
752 return ParseLambdaExpression();
755 // If lookahead indicates an ObjC message send...
756 // [identifier identifier
757 if (Next.is(tok::identifier) && After.is(tok::identifier)) {
761 // Here, we're stuck: lambda introducers and Objective-C message sends are
762 // unambiguous, but it requires arbitrary lookhead. [a,b,c,d,e,f,g] is a
763 // lambda, and [a,b,c,d,e,f,g h] is a Objective-C message send. Instead of
764 // writing two routines to parse a lambda introducer, just try to parse
765 // a lambda introducer first, and fall back if that fails.
766 // (TryParseLambdaIntroducer never produces any diagnostic output.)
767 LambdaIntroducer Intro;
768 if (TryParseLambdaIntroducer(Intro))
771 return ParseLambdaExpressionAfterIntroducer(Intro);
774 /// \brief Parse a lambda introducer.
775 /// \param Intro A LambdaIntroducer filled in with information about the
776 /// contents of the lambda-introducer.
777 /// \param SkippedInits If non-null, we are disambiguating between an Obj-C
778 /// message send and a lambda expression. In this mode, we will
779 /// sometimes skip the initializers for init-captures and not fully
780 /// populate \p Intro. This flag will be set to \c true if we do so.
781 /// \return A DiagnosticID if it hit something unexpected. The location for
782 /// for the diagnostic is that of the current token.
783 Optional<unsigned> Parser::ParseLambdaIntroducer(LambdaIntroducer &Intro,
784 bool *SkippedInits) {
785 typedef Optional<unsigned> DiagResult;
787 assert(Tok.is(tok::l_square) && "Lambda expressions begin with '['.");
788 BalancedDelimiterTracker T(*this, tok::l_square);
791 Intro.Range.setBegin(T.getOpenLocation());
795 // Parse capture-default.
796 if (Tok.is(tok::amp) &&
797 (NextToken().is(tok::comma) || NextToken().is(tok::r_square))) {
798 Intro.Default = LCD_ByRef;
799 Intro.DefaultLoc = ConsumeToken();
801 } else if (Tok.is(tok::equal)) {
802 Intro.Default = LCD_ByCopy;
803 Intro.DefaultLoc = ConsumeToken();
807 while (Tok.isNot(tok::r_square)) {
809 if (Tok.isNot(tok::comma)) {
810 // Provide a completion for a lambda introducer here. Except
811 // in Objective-C, where this is Almost Surely meant to be a message
812 // send. In that case, fail here and let the ObjC message
813 // expression parser perform the completion.
814 if (Tok.is(tok::code_completion) &&
815 !(getLangOpts().ObjC1 && Intro.Default == LCD_None &&
816 !Intro.Captures.empty())) {
817 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro,
818 /*AfterAmpersand=*/false);
823 return DiagResult(diag::err_expected_comma_or_rsquare);
828 if (Tok.is(tok::code_completion)) {
829 // If we're in Objective-C++ and we have a bare '[', then this is more
830 // likely to be a message receiver.
831 if (getLangOpts().ObjC1 && first)
832 Actions.CodeCompleteObjCMessageReceiver(getCurScope());
834 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro,
835 /*AfterAmpersand=*/false);
843 LambdaCaptureKind Kind = LCK_ByCopy;
845 IdentifierInfo *Id = nullptr;
846 SourceLocation EllipsisLoc;
849 if (Tok.is(tok::kw_this)) {
851 Loc = ConsumeToken();
853 if (Tok.is(tok::amp)) {
857 if (Tok.is(tok::code_completion)) {
858 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro,
859 /*AfterAmpersand=*/true);
865 if (Tok.is(tok::identifier)) {
866 Id = Tok.getIdentifierInfo();
867 Loc = ConsumeToken();
868 } else if (Tok.is(tok::kw_this)) {
869 // FIXME: If we want to suggest a fixit here, will need to return more
870 // than just DiagnosticID. Perhaps full DiagnosticBuilder that can be
871 // Clear()ed to prevent emission in case of tentative parsing?
872 return DiagResult(diag::err_this_captured_by_reference);
874 return DiagResult(diag::err_expected_capture);
877 if (Tok.is(tok::l_paren)) {
878 BalancedDelimiterTracker Parens(*this, tok::l_paren);
879 Parens.consumeOpen();
885 *SkippedInits = true;
886 } else if (ParseExpressionList(Exprs, Commas)) {
890 Parens.consumeClose();
891 Init = Actions.ActOnParenListExpr(Parens.getOpenLocation(),
892 Parens.getCloseLocation(),
895 } else if (Tok.isOneOf(tok::l_brace, tok::equal)) {
896 // Each lambda init-capture forms its own full expression, which clears
897 // Actions.MaybeODRUseExprs. So create an expression evaluation context
898 // to save the necessary state, and restore it later.
899 EnterExpressionEvaluationContext EC(Actions,
900 Sema::PotentiallyEvaluated);
901 bool HadEquals = TryConsumeToken(tok::equal);
904 // Warn on constructs that will change meaning when we implement N3922
905 if (!HadEquals && Tok.is(tok::l_brace)) {
906 Diag(Tok, diag::warn_init_capture_direct_list_init)
907 << FixItHint::CreateInsertion(Tok.getLocation(), "=");
909 Init = ParseInitializer();
910 } else if (Tok.is(tok::l_brace)) {
911 BalancedDelimiterTracker Braces(*this, tok::l_brace);
912 Braces.consumeOpen();
914 *SkippedInits = true;
916 // We're disambiguating this:
920 // We need to find the end of the following expression in order to
921 // determine whether this is an Obj-C message send's receiver, a
922 // C99 designator, or a lambda init-capture.
924 // Parse the expression to find where it ends, and annotate it back
925 // onto the tokens. We would have parsed this expression the same way
926 // in either case: both the RHS of an init-capture and the RHS of an
927 // assignment expression are parsed as an initializer-clause, and in
928 // neither case can anything be added to the scope between the '[' and
931 // FIXME: This is horrible. Adding a mechanism to skip an expression
932 // would be much cleaner.
933 // FIXME: If there is a ',' before the next ']' or ':', we can skip to
934 // that instead. (And if we see a ':' with no matching '?', we can
935 // classify this as an Obj-C message send.)
936 SourceLocation StartLoc = Tok.getLocation();
937 InMessageExpressionRAIIObject MaybeInMessageExpression(*this, true);
938 Init = ParseInitializer();
940 if (Tok.getLocation() != StartLoc) {
941 // Back out the lexing of the token after the initializer.
942 PP.RevertCachedTokens(1);
944 // Replace the consumed tokens with an appropriate annotation.
945 Tok.setLocation(StartLoc);
946 Tok.setKind(tok::annot_primary_expr);
947 setExprAnnotation(Tok, Init);
948 Tok.setAnnotationEndLoc(PP.getLastCachedTokenLocation());
949 PP.AnnotateCachedTokens(Tok);
951 // Consume the annotated initializer.
956 TryConsumeToken(tok::ellipsis, EllipsisLoc);
958 // If this is an init capture, process the initialization expression
959 // right away. For lambda init-captures such as the following:
961 // auto L = [i = x+1](int a) {
963 // &k = x](char b) { };
965 // keep in mind that each lambda init-capture has to have:
966 // - its initialization expression executed in the context
967 // of the enclosing/parent decl-context.
968 // - but the variable itself has to be 'injected' into the
969 // decl-context of its lambda's call-operator (which has
970 // not yet been created).
971 // Each init-expression is a full-expression that has to get
972 // Sema-analyzed (for capturing etc.) before its lambda's
973 // call-operator's decl-context, scope & scopeinfo are pushed on their
974 // respective stacks. Thus if any variable is odr-used in the init-capture
975 // it will correctly get captured in the enclosing lambda, if one exists.
976 // The init-variables above are created later once the lambdascope and
977 // call-operators decl-context is pushed onto its respective stack.
979 // Since the lambda init-capture's initializer expression occurs in the
980 // context of the enclosing function or lambda, therefore we can not wait
981 // till a lambda scope has been pushed on before deciding whether the
982 // variable needs to be captured. We also need to process all
983 // lvalue-to-rvalue conversions and discarded-value conversions,
984 // so that we can avoid capturing certain constant variables.
988 // auto L = [&z = x](char a) { <-- don't capture by the current lambda
989 // return [y = x](int i) { <-- don't capture by enclosing lambda
993 // If x was not const, the second use would require 'L' to capture, and
994 // that would be an error.
996 ParsedType InitCaptureParsedType;
997 if (Init.isUsable()) {
998 // Get the pointer and store it in an lvalue, so we can use it as an
1000 Expr *InitExpr = Init.get();
1001 // This performs any lvalue-to-rvalue conversions if necessary, which
1002 // can affect what gets captured in the containing decl-context.
1003 QualType InitCaptureType = Actions.performLambdaInitCaptureInitialization(
1004 Loc, Kind == LCK_ByRef, Id, InitExpr);
1006 InitCaptureParsedType.set(InitCaptureType);
1008 Intro.addCapture(Kind, Loc, Id, EllipsisLoc, Init, InitCaptureParsedType);
1012 Intro.Range.setEnd(T.getCloseLocation());
1013 return DiagResult();
1016 /// TryParseLambdaIntroducer - Tentatively parse a lambda introducer.
1018 /// Returns true if it hit something unexpected.
1019 bool Parser::TryParseLambdaIntroducer(LambdaIntroducer &Intro) {
1020 TentativeParsingAction PA(*this);
1022 bool SkippedInits = false;
1023 Optional<unsigned> DiagID(ParseLambdaIntroducer(Intro, &SkippedInits));
1031 // Parse it again, but this time parse the init-captures too.
1033 Intro = LambdaIntroducer();
1034 DiagID = ParseLambdaIntroducer(Intro);
1035 assert(!DiagID && "parsing lambda-introducer failed on reparse");
1043 /// ParseLambdaExpressionAfterIntroducer - Parse the rest of a lambda
1045 ExprResult Parser::ParseLambdaExpressionAfterIntroducer(
1046 LambdaIntroducer &Intro) {
1047 SourceLocation LambdaBeginLoc = Intro.Range.getBegin();
1048 Diag(LambdaBeginLoc, diag::warn_cxx98_compat_lambda);
1050 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), LambdaBeginLoc,
1051 "lambda expression parsing");
1055 // FIXME: Call into Actions to add any init-capture declarations to the
1056 // scope while parsing the lambda-declarator and compound-statement.
1058 // Parse lambda-declarator[opt].
1059 DeclSpec DS(AttrFactory);
1060 Declarator D(DS, Declarator::LambdaExprContext);
1061 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1062 Actions.PushLambdaScope();
1064 TypeResult TrailingReturnType;
1065 if (Tok.is(tok::l_paren)) {
1066 ParseScope PrototypeScope(this,
1067 Scope::FunctionPrototypeScope |
1068 Scope::FunctionDeclarationScope |
1071 SourceLocation DeclEndLoc;
1072 BalancedDelimiterTracker T(*this, tok::l_paren);
1074 SourceLocation LParenLoc = T.getOpenLocation();
1076 // Parse parameter-declaration-clause.
1077 ParsedAttributes Attr(AttrFactory);
1078 SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
1079 SourceLocation EllipsisLoc;
1081 if (Tok.isNot(tok::r_paren)) {
1082 Actions.RecordParsingTemplateParameterDepth(TemplateParameterDepth);
1083 ParseParameterDeclarationClause(D, Attr, ParamInfo, EllipsisLoc);
1084 // For a generic lambda, each 'auto' within the parameter declaration
1085 // clause creates a template type parameter, so increment the depth.
1086 if (Actions.getCurGenericLambda())
1087 ++CurTemplateDepthTracker;
1090 SourceLocation RParenLoc = T.getCloseLocation();
1091 DeclEndLoc = RParenLoc;
1093 // GNU-style attributes must be parsed before the mutable specifier to be
1094 // compatible with GCC.
1095 MaybeParseGNUAttributes(Attr, &DeclEndLoc);
1097 // MSVC-style attributes must be parsed before the mutable specifier to be
1098 // compatible with MSVC.
1099 MaybeParseMicrosoftDeclSpecs(Attr, &DeclEndLoc);
1101 // Parse 'mutable'[opt].
1102 SourceLocation MutableLoc;
1103 if (TryConsumeToken(tok::kw_mutable, MutableLoc))
1104 DeclEndLoc = MutableLoc;
1106 // Parse exception-specification[opt].
1107 ExceptionSpecificationType ESpecType = EST_None;
1108 SourceRange ESpecRange;
1109 SmallVector<ParsedType, 2> DynamicExceptions;
1110 SmallVector<SourceRange, 2> DynamicExceptionRanges;
1111 ExprResult NoexceptExpr;
1112 CachedTokens *ExceptionSpecTokens;
1113 ESpecType = tryParseExceptionSpecification(/*Delayed=*/false,
1116 DynamicExceptionRanges,
1118 ExceptionSpecTokens);
1120 if (ESpecType != EST_None)
1121 DeclEndLoc = ESpecRange.getEnd();
1123 // Parse attribute-specifier[opt].
1124 MaybeParseCXX11Attributes(Attr, &DeclEndLoc);
1126 SourceLocation FunLocalRangeEnd = DeclEndLoc;
1128 // Parse trailing-return-type[opt].
1129 if (Tok.is(tok::arrow)) {
1130 FunLocalRangeEnd = Tok.getLocation();
1132 TrailingReturnType = ParseTrailingReturnType(Range);
1133 if (Range.getEnd().isValid())
1134 DeclEndLoc = Range.getEnd();
1137 PrototypeScope.Exit();
1139 SourceLocation NoLoc;
1140 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true,
1141 /*isAmbiguous=*/false,
1143 ParamInfo.data(), ParamInfo.size(),
1144 EllipsisLoc, RParenLoc,
1145 DS.getTypeQualifiers(),
1146 /*RefQualifierIsLValueRef=*/true,
1147 /*RefQualifierLoc=*/NoLoc,
1148 /*ConstQualifierLoc=*/NoLoc,
1149 /*VolatileQualifierLoc=*/NoLoc,
1150 /*RestrictQualifierLoc=*/NoLoc,
1152 ESpecType, ESpecRange.getBegin(),
1153 DynamicExceptions.data(),
1154 DynamicExceptionRanges.data(),
1155 DynamicExceptions.size(),
1156 NoexceptExpr.isUsable() ?
1157 NoexceptExpr.get() : nullptr,
1158 /*ExceptionSpecTokens*/nullptr,
1159 LParenLoc, FunLocalRangeEnd, D,
1160 TrailingReturnType),
1162 } else if (Tok.isOneOf(tok::kw_mutable, tok::arrow, tok::kw___attribute) ||
1163 (Tok.is(tok::l_square) && NextToken().is(tok::l_square))) {
1164 // It's common to forget that one needs '()' before 'mutable', an attribute
1165 // specifier, or the result type. Deal with this.
1166 unsigned TokKind = 0;
1167 switch (Tok.getKind()) {
1168 case tok::kw_mutable: TokKind = 0; break;
1169 case tok::arrow: TokKind = 1; break;
1170 case tok::kw___attribute:
1171 case tok::l_square: TokKind = 2; break;
1172 default: llvm_unreachable("Unknown token kind");
1175 Diag(Tok, diag::err_lambda_missing_parens)
1177 << FixItHint::CreateInsertion(Tok.getLocation(), "() ");
1178 SourceLocation DeclLoc = Tok.getLocation();
1179 SourceLocation DeclEndLoc = DeclLoc;
1181 // GNU-style attributes must be parsed before the mutable specifier to be
1182 // compatible with GCC.
1183 ParsedAttributes Attr(AttrFactory);
1184 MaybeParseGNUAttributes(Attr, &DeclEndLoc);
1186 // Parse 'mutable', if it's there.
1187 SourceLocation MutableLoc;
1188 if (Tok.is(tok::kw_mutable)) {
1189 MutableLoc = ConsumeToken();
1190 DeclEndLoc = MutableLoc;
1193 // Parse attribute-specifier[opt].
1194 MaybeParseCXX11Attributes(Attr, &DeclEndLoc);
1196 // Parse the return type, if there is one.
1197 if (Tok.is(tok::arrow)) {
1199 TrailingReturnType = ParseTrailingReturnType(Range);
1200 if (Range.getEnd().isValid())
1201 DeclEndLoc = Range.getEnd();
1204 SourceLocation NoLoc;
1205 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true,
1206 /*isAmbiguous=*/false,
1207 /*LParenLoc=*/NoLoc,
1210 /*EllipsisLoc=*/NoLoc,
1211 /*RParenLoc=*/NoLoc,
1213 /*RefQualifierIsLValueRef=*/true,
1214 /*RefQualifierLoc=*/NoLoc,
1215 /*ConstQualifierLoc=*/NoLoc,
1216 /*VolatileQualifierLoc=*/NoLoc,
1217 /*RestrictQualifierLoc=*/NoLoc,
1221 /*Exceptions=*/nullptr,
1222 /*ExceptionRanges=*/nullptr,
1223 /*NumExceptions=*/0,
1224 /*NoexceptExpr=*/nullptr,
1225 /*ExceptionSpecTokens=*/nullptr,
1226 DeclLoc, DeclEndLoc, D,
1227 TrailingReturnType),
1232 // FIXME: Rename BlockScope -> ClosureScope if we decide to continue using
1234 unsigned ScopeFlags = Scope::BlockScope | Scope::FnScope | Scope::DeclScope;
1235 ParseScope BodyScope(this, ScopeFlags);
1237 Actions.ActOnStartOfLambdaDefinition(Intro, D, getCurScope());
1239 // Parse compound-statement.
1240 if (!Tok.is(tok::l_brace)) {
1241 Diag(Tok, diag::err_expected_lambda_body);
1242 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope());
1246 StmtResult Stmt(ParseCompoundStatementBody());
1249 if (!Stmt.isInvalid() && !TrailingReturnType.isInvalid())
1250 return Actions.ActOnLambdaExpr(LambdaBeginLoc, Stmt.get(), getCurScope());
1252 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope());
1256 /// ParseCXXCasts - This handles the various ways to cast expressions to another
1259 /// postfix-expression: [C++ 5.2p1]
1260 /// 'dynamic_cast' '<' type-name '>' '(' expression ')'
1261 /// 'static_cast' '<' type-name '>' '(' expression ')'
1262 /// 'reinterpret_cast' '<' type-name '>' '(' expression ')'
1263 /// 'const_cast' '<' type-name '>' '(' expression ')'
1265 ExprResult Parser::ParseCXXCasts() {
1266 tok::TokenKind Kind = Tok.getKind();
1267 const char *CastName = nullptr; // For error messages
1270 default: llvm_unreachable("Unknown C++ cast!");
1271 case tok::kw_const_cast: CastName = "const_cast"; break;
1272 case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break;
1273 case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break;
1274 case tok::kw_static_cast: CastName = "static_cast"; break;
1277 SourceLocation OpLoc = ConsumeToken();
1278 SourceLocation LAngleBracketLoc = Tok.getLocation();
1280 // Check for "<::" which is parsed as "[:". If found, fix token stream,
1281 // diagnose error, suggest fix, and recover parsing.
1282 if (Tok.is(tok::l_square) && Tok.getLength() == 2) {
1283 Token Next = NextToken();
1284 if (Next.is(tok::colon) && areTokensAdjacent(Tok, Next))
1285 FixDigraph(*this, PP, Tok, Next, Kind, /*AtDigraph*/true);
1288 if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName))
1291 // Parse the common declaration-specifiers piece.
1292 DeclSpec DS(AttrFactory);
1293 ParseSpecifierQualifierList(DS);
1295 // Parse the abstract-declarator, if present.
1296 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1297 ParseDeclarator(DeclaratorInfo);
1299 SourceLocation RAngleBracketLoc = Tok.getLocation();
1301 if (ExpectAndConsume(tok::greater))
1302 return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << tok::less);
1304 SourceLocation LParenLoc, RParenLoc;
1305 BalancedDelimiterTracker T(*this, tok::l_paren);
1307 if (T.expectAndConsume(diag::err_expected_lparen_after, CastName))
1310 ExprResult Result = ParseExpression();
1315 if (!Result.isInvalid() && !DeclaratorInfo.isInvalidType())
1316 Result = Actions.ActOnCXXNamedCast(OpLoc, Kind,
1317 LAngleBracketLoc, DeclaratorInfo,
1319 T.getOpenLocation(), Result.get(),
1320 T.getCloseLocation());
1325 /// ParseCXXTypeid - This handles the C++ typeid expression.
1327 /// postfix-expression: [C++ 5.2p1]
1328 /// 'typeid' '(' expression ')'
1329 /// 'typeid' '(' type-id ')'
1331 ExprResult Parser::ParseCXXTypeid() {
1332 assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!");
1334 SourceLocation OpLoc = ConsumeToken();
1335 SourceLocation LParenLoc, RParenLoc;
1336 BalancedDelimiterTracker T(*this, tok::l_paren);
1338 // typeid expressions are always parenthesized.
1339 if (T.expectAndConsume(diag::err_expected_lparen_after, "typeid"))
1341 LParenLoc = T.getOpenLocation();
1345 // C++0x [expr.typeid]p3:
1346 // When typeid is applied to an expression other than an lvalue of a
1347 // polymorphic class type [...] The expression is an unevaluated
1348 // operand (Clause 5).
1350 // Note that we can't tell whether the expression is an lvalue of a
1351 // polymorphic class type until after we've parsed the expression; we
1352 // speculatively assume the subexpression is unevaluated, and fix it up
1355 // We enter the unevaluated context before trying to determine whether we
1356 // have a type-id, because the tentative parse logic will try to resolve
1357 // names, and must treat them as unevaluated.
1358 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
1359 Sema::ReuseLambdaContextDecl);
1361 if (isTypeIdInParens()) {
1362 TypeResult Ty = ParseTypeName();
1366 RParenLoc = T.getCloseLocation();
1367 if (Ty.isInvalid() || RParenLoc.isInvalid())
1370 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true,
1371 Ty.get().getAsOpaquePtr(), RParenLoc);
1373 Result = ParseExpression();
1376 if (Result.isInvalid())
1377 SkipUntil(tok::r_paren, StopAtSemi);
1380 RParenLoc = T.getCloseLocation();
1381 if (RParenLoc.isInvalid())
1384 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false,
1385 Result.get(), RParenLoc);
1392 /// ParseCXXUuidof - This handles the Microsoft C++ __uuidof expression.
1394 /// '__uuidof' '(' expression ')'
1395 /// '__uuidof' '(' type-id ')'
1397 ExprResult Parser::ParseCXXUuidof() {
1398 assert(Tok.is(tok::kw___uuidof) && "Not '__uuidof'!");
1400 SourceLocation OpLoc = ConsumeToken();
1401 BalancedDelimiterTracker T(*this, tok::l_paren);
1403 // __uuidof expressions are always parenthesized.
1404 if (T.expectAndConsume(diag::err_expected_lparen_after, "__uuidof"))
1409 if (isTypeIdInParens()) {
1410 TypeResult Ty = ParseTypeName();
1418 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), /*isType=*/true,
1419 Ty.get().getAsOpaquePtr(),
1420 T.getCloseLocation());
1422 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
1423 Result = ParseExpression();
1426 if (Result.isInvalid())
1427 SkipUntil(tok::r_paren, StopAtSemi);
1431 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(),
1433 Result.get(), T.getCloseLocation());
1440 /// \brief Parse a C++ pseudo-destructor expression after the base,
1441 /// . or -> operator, and nested-name-specifier have already been
1444 /// postfix-expression: [C++ 5.2]
1445 /// postfix-expression . pseudo-destructor-name
1446 /// postfix-expression -> pseudo-destructor-name
1448 /// pseudo-destructor-name:
1449 /// ::[opt] nested-name-specifier[opt] type-name :: ~type-name
1450 /// ::[opt] nested-name-specifier template simple-template-id ::
1452 /// ::[opt] nested-name-specifier[opt] ~type-name
1455 Parser::ParseCXXPseudoDestructor(Expr *Base, SourceLocation OpLoc,
1456 tok::TokenKind OpKind,
1458 ParsedType ObjectType) {
1459 // We're parsing either a pseudo-destructor-name or a dependent
1460 // member access that has the same form as a
1461 // pseudo-destructor-name. We parse both in the same way and let
1462 // the action model sort them out.
1464 // Note that the ::[opt] nested-name-specifier[opt] has already
1465 // been parsed, and if there was a simple-template-id, it has
1466 // been coalesced into a template-id annotation token.
1467 UnqualifiedId FirstTypeName;
1468 SourceLocation CCLoc;
1469 if (Tok.is(tok::identifier)) {
1470 FirstTypeName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1472 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail");
1473 CCLoc = ConsumeToken();
1474 } else if (Tok.is(tok::annot_template_id)) {
1475 // FIXME: retrieve TemplateKWLoc from template-id annotation and
1476 // store it in the pseudo-dtor node (to be used when instantiating it).
1477 FirstTypeName.setTemplateId(
1478 (TemplateIdAnnotation *)Tok.getAnnotationValue());
1480 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail");
1481 CCLoc = ConsumeToken();
1483 FirstTypeName.setIdentifier(nullptr, SourceLocation());
1487 assert(Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail");
1488 SourceLocation TildeLoc = ConsumeToken();
1490 if (Tok.is(tok::kw_decltype) && !FirstTypeName.isValid() && SS.isEmpty()) {
1491 DeclSpec DS(AttrFactory);
1492 ParseDecltypeSpecifier(DS);
1493 if (DS.getTypeSpecType() == TST_error)
1495 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, OpKind,
1499 if (!Tok.is(tok::identifier)) {
1500 Diag(Tok, diag::err_destructor_tilde_identifier);
1504 // Parse the second type.
1505 UnqualifiedId SecondTypeName;
1506 IdentifierInfo *Name = Tok.getIdentifierInfo();
1507 SourceLocation NameLoc = ConsumeToken();
1508 SecondTypeName.setIdentifier(Name, NameLoc);
1510 // If there is a '<', the second type name is a template-id. Parse
1512 if (Tok.is(tok::less) &&
1513 ParseUnqualifiedIdTemplateId(SS, SourceLocation(),
1515 false, ObjectType, SecondTypeName,
1516 /*AssumeTemplateName=*/true))
1519 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, OpKind,
1520 SS, FirstTypeName, CCLoc, TildeLoc,
1524 /// ParseCXXBoolLiteral - This handles the C++ Boolean literals.
1526 /// boolean-literal: [C++ 2.13.5]
1529 ExprResult Parser::ParseCXXBoolLiteral() {
1530 tok::TokenKind Kind = Tok.getKind();
1531 return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind);
1534 /// ParseThrowExpression - This handles the C++ throw expression.
1536 /// throw-expression: [C++ 15]
1537 /// 'throw' assignment-expression[opt]
1538 ExprResult Parser::ParseThrowExpression() {
1539 assert(Tok.is(tok::kw_throw) && "Not throw!");
1540 SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token.
1542 // If the current token isn't the start of an assignment-expression,
1543 // then the expression is not present. This handles things like:
1544 // "C ? throw : (void)42", which is crazy but legal.
1545 switch (Tok.getKind()) { // FIXME: move this predicate somewhere common.
1552 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, nullptr);
1555 ExprResult Expr(ParseAssignmentExpression());
1556 if (Expr.isInvalid()) return Expr;
1557 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, Expr.get());
1561 /// ParseCXXThis - This handles the C++ 'this' pointer.
1563 /// C++ 9.3.2: In the body of a non-static member function, the keyword this is
1564 /// a non-lvalue expression whose value is the address of the object for which
1565 /// the function is called.
1566 ExprResult Parser::ParseCXXThis() {
1567 assert(Tok.is(tok::kw_this) && "Not 'this'!");
1568 SourceLocation ThisLoc = ConsumeToken();
1569 return Actions.ActOnCXXThis(ThisLoc);
1572 /// ParseCXXTypeConstructExpression - Parse construction of a specified type.
1573 /// Can be interpreted either as function-style casting ("int(x)")
1574 /// or class type construction ("ClassType(x,y,z)")
1575 /// or creation of a value-initialized type ("int()").
1576 /// See [C++ 5.2.3].
1578 /// postfix-expression: [C++ 5.2p1]
1579 /// simple-type-specifier '(' expression-list[opt] ')'
1580 /// [C++0x] simple-type-specifier braced-init-list
1581 /// typename-specifier '(' expression-list[opt] ')'
1582 /// [C++0x] typename-specifier braced-init-list
1585 Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) {
1586 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1587 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo).get();
1589 assert((Tok.is(tok::l_paren) ||
1590 (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)))
1591 && "Expected '(' or '{'!");
1593 if (Tok.is(tok::l_brace)) {
1594 ExprResult Init = ParseBraceInitializer();
1595 if (Init.isInvalid())
1597 Expr *InitList = Init.get();
1598 return Actions.ActOnCXXTypeConstructExpr(TypeRep, SourceLocation(),
1599 MultiExprArg(&InitList, 1),
1602 BalancedDelimiterTracker T(*this, tok::l_paren);
1606 CommaLocsTy CommaLocs;
1608 if (Tok.isNot(tok::r_paren)) {
1609 if (ParseExpressionList(Exprs, CommaLocs, [&] {
1610 Actions.CodeCompleteConstructor(getCurScope(),
1611 TypeRep.get()->getCanonicalTypeInternal(),
1612 DS.getLocEnd(), Exprs);
1614 SkipUntil(tok::r_paren, StopAtSemi);
1622 // TypeRep could be null, if it references an invalid typedef.
1626 assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&&
1627 "Unexpected number of commas!");
1628 return Actions.ActOnCXXTypeConstructExpr(TypeRep, T.getOpenLocation(),
1630 T.getCloseLocation());
1634 /// ParseCXXCondition - if/switch/while condition expression.
1638 /// type-specifier-seq declarator '=' assignment-expression
1639 /// [C++11] type-specifier-seq declarator '=' initializer-clause
1640 /// [C++11] type-specifier-seq declarator braced-init-list
1641 /// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt]
1642 /// '=' assignment-expression
1644 /// \param ExprOut if the condition was parsed as an expression, the parsed
1647 /// \param DeclOut if the condition was parsed as a declaration, the parsed
1650 /// \param Loc The location of the start of the statement that requires this
1651 /// condition, e.g., the "for" in a for loop.
1653 /// \param ConvertToBoolean Whether the condition expression should be
1654 /// converted to a boolean value.
1656 /// \returns true if there was a parsing, false otherwise.
1657 bool Parser::ParseCXXCondition(ExprResult &ExprOut,
1660 bool ConvertToBoolean) {
1661 if (Tok.is(tok::code_completion)) {
1662 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition);
1667 ParsedAttributesWithRange attrs(AttrFactory);
1668 MaybeParseCXX11Attributes(attrs);
1670 if (!isCXXConditionDeclaration()) {
1671 ProhibitAttributes(attrs);
1673 // Parse the expression.
1674 ExprOut = ParseExpression(); // expression
1676 if (ExprOut.isInvalid())
1679 // If required, convert to a boolean value.
1680 if (ConvertToBoolean)
1682 = Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprOut.get());
1683 return ExprOut.isInvalid();
1686 // type-specifier-seq
1687 DeclSpec DS(AttrFactory);
1688 DS.takeAttributesFrom(attrs);
1689 ParseSpecifierQualifierList(DS, AS_none, DSC_condition);
1692 Declarator DeclaratorInfo(DS, Declarator::ConditionContext);
1693 ParseDeclarator(DeclaratorInfo);
1695 // simple-asm-expr[opt]
1696 if (Tok.is(tok::kw_asm)) {
1698 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1699 if (AsmLabel.isInvalid()) {
1700 SkipUntil(tok::semi, StopAtSemi);
1703 DeclaratorInfo.setAsmLabel(AsmLabel.get());
1704 DeclaratorInfo.SetRangeEnd(Loc);
1707 // If attributes are present, parse them.
1708 MaybeParseGNUAttributes(DeclaratorInfo);
1710 // Type-check the declaration itself.
1711 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(),
1713 DeclOut = Dcl.get();
1714 ExprOut = ExprError();
1716 // '=' assignment-expression
1717 // If a '==' or '+=' is found, suggest a fixit to '='.
1718 bool CopyInitialization = isTokenEqualOrEqualTypo();
1719 if (CopyInitialization)
1722 ExprResult InitExpr = ExprError();
1723 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1724 Diag(Tok.getLocation(),
1725 diag::warn_cxx98_compat_generalized_initializer_lists);
1726 InitExpr = ParseBraceInitializer();
1727 } else if (CopyInitialization) {
1728 InitExpr = ParseAssignmentExpression();
1729 } else if (Tok.is(tok::l_paren)) {
1730 // This was probably an attempt to initialize the variable.
1731 SourceLocation LParen = ConsumeParen(), RParen = LParen;
1732 if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch))
1733 RParen = ConsumeParen();
1734 Diag(DeclOut ? DeclOut->getLocation() : LParen,
1735 diag::err_expected_init_in_condition_lparen)
1736 << SourceRange(LParen, RParen);
1738 Diag(DeclOut ? DeclOut->getLocation() : Tok.getLocation(),
1739 diag::err_expected_init_in_condition);
1742 if (!InitExpr.isInvalid())
1743 Actions.AddInitializerToDecl(DeclOut, InitExpr.get(), !CopyInitialization,
1744 DS.containsPlaceholderType());
1746 Actions.ActOnInitializerError(DeclOut);
1748 // FIXME: Build a reference to this declaration? Convert it to bool?
1749 // (This is currently handled by Sema).
1751 Actions.FinalizeDeclaration(DeclOut);
1756 /// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers.
1757 /// This should only be called when the current token is known to be part of
1758 /// simple-type-specifier.
1760 /// simple-type-specifier:
1761 /// '::'[opt] nested-name-specifier[opt] type-name
1762 /// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO]
1774 /// [GNU] typeof-specifier
1775 /// [C++0x] auto [TODO]
1782 void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) {
1783 DS.SetRangeStart(Tok.getLocation());
1784 const char *PrevSpec;
1786 SourceLocation Loc = Tok.getLocation();
1787 const clang::PrintingPolicy &Policy =
1788 Actions.getASTContext().getPrintingPolicy();
1790 switch (Tok.getKind()) {
1791 case tok::identifier: // foo::bar
1792 case tok::coloncolon: // ::foo::bar
1793 llvm_unreachable("Annotation token should already be formed!");
1795 llvm_unreachable("Not a simple-type-specifier token!");
1798 case tok::annot_typename: {
1799 if (getTypeAnnotation(Tok))
1800 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID,
1801 getTypeAnnotation(Tok), Policy);
1803 DS.SetTypeSpecError();
1805 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1808 DS.Finish(Diags, PP, Policy);
1814 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID, Policy);
1817 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID, Policy);
1819 case tok::kw___int64:
1820 DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, DiagID, Policy);
1822 case tok::kw_signed:
1823 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID);
1825 case tok::kw_unsigned:
1826 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID);
1829 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID, Policy);
1832 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID, Policy);
1835 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID, Policy);
1837 case tok::kw___int128:
1838 DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec, DiagID, Policy);
1841 DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, DiagID, Policy);
1844 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID, Policy);
1846 case tok::kw_double:
1847 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID, Policy);
1849 case tok::kw_wchar_t:
1850 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID, Policy);
1852 case tok::kw_char16_t:
1853 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID, Policy);
1855 case tok::kw_char32_t:
1856 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID, Policy);
1859 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID, Policy);
1861 case tok::annot_decltype:
1862 case tok::kw_decltype:
1863 DS.SetRangeEnd(ParseDecltypeSpecifier(DS));
1864 return DS.Finish(Diags, PP, Policy);
1866 // GNU typeof support.
1867 case tok::kw_typeof:
1868 ParseTypeofSpecifier(DS);
1869 DS.Finish(Diags, PP, Policy);
1872 if (Tok.is(tok::annot_typename))
1873 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1875 DS.SetRangeEnd(Tok.getLocation());
1877 DS.Finish(Diags, PP, Policy);
1880 /// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++
1881 /// [dcl.name]), which is a non-empty sequence of type-specifiers,
1882 /// e.g., "const short int". Note that the DeclSpec is *not* finished
1883 /// by parsing the type-specifier-seq, because these sequences are
1884 /// typically followed by some form of declarator. Returns true and
1885 /// emits diagnostics if this is not a type-specifier-seq, false
1888 /// type-specifier-seq: [C++ 8.1]
1889 /// type-specifier type-specifier-seq[opt]
1891 bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) {
1892 ParseSpecifierQualifierList(DS, AS_none, DSC_type_specifier);
1893 DS.Finish(Diags, PP, Actions.getASTContext().getPrintingPolicy());
1897 /// \brief Finish parsing a C++ unqualified-id that is a template-id of
1900 /// This routine is invoked when a '<' is encountered after an identifier or
1901 /// operator-function-id is parsed by \c ParseUnqualifiedId() to determine
1902 /// whether the unqualified-id is actually a template-id. This routine will
1903 /// then parse the template arguments and form the appropriate template-id to
1904 /// return to the caller.
1906 /// \param SS the nested-name-specifier that precedes this template-id, if
1907 /// we're actually parsing a qualified-id.
1909 /// \param Name for constructor and destructor names, this is the actual
1910 /// identifier that may be a template-name.
1912 /// \param NameLoc the location of the class-name in a constructor or
1915 /// \param EnteringContext whether we're entering the scope of the
1916 /// nested-name-specifier.
1918 /// \param ObjectType if this unqualified-id occurs within a member access
1919 /// expression, the type of the base object whose member is being accessed.
1921 /// \param Id as input, describes the template-name or operator-function-id
1922 /// that precedes the '<'. If template arguments were parsed successfully,
1923 /// will be updated with the template-id.
1925 /// \param AssumeTemplateId When true, this routine will assume that the name
1926 /// refers to a template without performing name lookup to verify.
1928 /// \returns true if a parse error occurred, false otherwise.
1929 bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS,
1930 SourceLocation TemplateKWLoc,
1931 IdentifierInfo *Name,
1932 SourceLocation NameLoc,
1933 bool EnteringContext,
1934 ParsedType ObjectType,
1936 bool AssumeTemplateId) {
1937 assert((AssumeTemplateId || Tok.is(tok::less)) &&
1938 "Expected '<' to finish parsing a template-id");
1940 TemplateTy Template;
1941 TemplateNameKind TNK = TNK_Non_template;
1942 switch (Id.getKind()) {
1943 case UnqualifiedId::IK_Identifier:
1944 case UnqualifiedId::IK_OperatorFunctionId:
1945 case UnqualifiedId::IK_LiteralOperatorId:
1946 if (AssumeTemplateId) {
1947 TNK = Actions.ActOnDependentTemplateName(getCurScope(), SS, TemplateKWLoc,
1948 Id, ObjectType, EnteringContext,
1950 if (TNK == TNK_Non_template)
1953 bool MemberOfUnknownSpecialization;
1954 TNK = Actions.isTemplateName(getCurScope(), SS,
1955 TemplateKWLoc.isValid(), Id,
1956 ObjectType, EnteringContext, Template,
1957 MemberOfUnknownSpecialization);
1959 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization &&
1960 ObjectType && IsTemplateArgumentList()) {
1961 // We have something like t->getAs<T>(), where getAs is a
1962 // member of an unknown specialization. However, this will only
1963 // parse correctly as a template, so suggest the keyword 'template'
1964 // before 'getAs' and treat this as a dependent template name.
1966 if (Id.getKind() == UnqualifiedId::IK_Identifier)
1967 Name = Id.Identifier->getName();
1970 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId)
1971 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator);
1973 Name += Id.Identifier->getName();
1975 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword)
1977 << FixItHint::CreateInsertion(Id.StartLocation, "template ");
1978 TNK = Actions.ActOnDependentTemplateName(getCurScope(),
1979 SS, TemplateKWLoc, Id,
1980 ObjectType, EnteringContext,
1982 if (TNK == TNK_Non_template)
1988 case UnqualifiedId::IK_ConstructorName: {
1989 UnqualifiedId TemplateName;
1990 bool MemberOfUnknownSpecialization;
1991 TemplateName.setIdentifier(Name, NameLoc);
1992 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
1993 TemplateName, ObjectType,
1994 EnteringContext, Template,
1995 MemberOfUnknownSpecialization);
1999 case UnqualifiedId::IK_DestructorName: {
2000 UnqualifiedId TemplateName;
2001 bool MemberOfUnknownSpecialization;
2002 TemplateName.setIdentifier(Name, NameLoc);
2004 TNK = Actions.ActOnDependentTemplateName(getCurScope(),
2005 SS, TemplateKWLoc, TemplateName,
2006 ObjectType, EnteringContext,
2008 if (TNK == TNK_Non_template)
2011 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2012 TemplateName, ObjectType,
2013 EnteringContext, Template,
2014 MemberOfUnknownSpecialization);
2016 if (TNK == TNK_Non_template && !Id.DestructorName.get()) {
2017 Diag(NameLoc, diag::err_destructor_template_id)
2018 << Name << SS.getRange();
2029 if (TNK == TNK_Non_template)
2032 // Parse the enclosed template argument list.
2033 SourceLocation LAngleLoc, RAngleLoc;
2034 TemplateArgList TemplateArgs;
2035 if (Tok.is(tok::less) &&
2036 ParseTemplateIdAfterTemplateName(Template, Id.StartLocation,
2037 SS, true, LAngleLoc,
2042 if (Id.getKind() == UnqualifiedId::IK_Identifier ||
2043 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2044 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) {
2045 // Form a parsed representation of the template-id to be stored in the
2047 TemplateIdAnnotation *TemplateId
2048 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds);
2050 // FIXME: Store name for literal operator too.
2051 if (Id.getKind() == UnqualifiedId::IK_Identifier) {
2052 TemplateId->Name = Id.Identifier;
2053 TemplateId->Operator = OO_None;
2054 TemplateId->TemplateNameLoc = Id.StartLocation;
2056 TemplateId->Name = nullptr;
2057 TemplateId->Operator = Id.OperatorFunctionId.Operator;
2058 TemplateId->TemplateNameLoc = Id.StartLocation;
2061 TemplateId->SS = SS;
2062 TemplateId->TemplateKWLoc = TemplateKWLoc;
2063 TemplateId->Template = Template;
2064 TemplateId->Kind = TNK;
2065 TemplateId->LAngleLoc = LAngleLoc;
2066 TemplateId->RAngleLoc = RAngleLoc;
2067 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
2068 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size();
2069 Arg != ArgEnd; ++Arg)
2070 Args[Arg] = TemplateArgs[Arg];
2072 Id.setTemplateId(TemplateId);
2076 // Bundle the template arguments together.
2077 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
2079 // Constructor and destructor names.
2081 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
2083 LAngleLoc, TemplateArgsPtr, RAngleLoc,
2084 /*IsCtorOrDtorName=*/true);
2085 if (Type.isInvalid())
2088 if (Id.getKind() == UnqualifiedId::IK_ConstructorName)
2089 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc);
2091 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc);
2096 /// \brief Parse an operator-function-id or conversion-function-id as part
2097 /// of a C++ unqualified-id.
2099 /// This routine is responsible only for parsing the operator-function-id or
2100 /// conversion-function-id; it does not handle template arguments in any way.
2103 /// operator-function-id: [C++ 13.5]
2104 /// 'operator' operator
2106 /// operator: one of
2107 /// new delete new[] delete[]
2108 /// + - * / % ^ & | ~
2109 /// ! = < > += -= *= /= %=
2110 /// ^= &= |= << >> >>= <<= == !=
2111 /// <= >= && || ++ -- , ->* ->
2114 /// conversion-function-id: [C++ 12.3.2]
2115 /// operator conversion-type-id
2117 /// conversion-type-id:
2118 /// type-specifier-seq conversion-declarator[opt]
2120 /// conversion-declarator:
2121 /// ptr-operator conversion-declarator[opt]
2124 /// \param SS The nested-name-specifier that preceded this unqualified-id. If
2125 /// non-empty, then we are parsing the unqualified-id of a qualified-id.
2127 /// \param EnteringContext whether we are entering the scope of the
2128 /// nested-name-specifier.
2130 /// \param ObjectType if this unqualified-id occurs within a member access
2131 /// expression, the type of the base object whose member is being accessed.
2133 /// \param Result on a successful parse, contains the parsed unqualified-id.
2135 /// \returns true if parsing fails, false otherwise.
2136 bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext,
2137 ParsedType ObjectType,
2138 UnqualifiedId &Result) {
2139 assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword");
2141 // Consume the 'operator' keyword.
2142 SourceLocation KeywordLoc = ConsumeToken();
2144 // Determine what kind of operator name we have.
2145 unsigned SymbolIdx = 0;
2146 SourceLocation SymbolLocations[3];
2147 OverloadedOperatorKind Op = OO_None;
2148 switch (Tok.getKind()) {
2150 case tok::kw_delete: {
2151 bool isNew = Tok.getKind() == tok::kw_new;
2152 // Consume the 'new' or 'delete'.
2153 SymbolLocations[SymbolIdx++] = ConsumeToken();
2154 // Check for array new/delete.
2155 if (Tok.is(tok::l_square) &&
2156 (!getLangOpts().CPlusPlus11 || NextToken().isNot(tok::l_square))) {
2157 // Consume the '[' and ']'.
2158 BalancedDelimiterTracker T(*this, tok::l_square);
2161 if (T.getCloseLocation().isInvalid())
2164 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2165 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2166 Op = isNew? OO_Array_New : OO_Array_Delete;
2168 Op = isNew? OO_New : OO_Delete;
2173 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
2175 SymbolLocations[SymbolIdx++] = ConsumeToken(); \
2178 #define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly)
2179 #include "clang/Basic/OperatorKinds.def"
2181 case tok::l_paren: {
2182 // Consume the '(' and ')'.
2183 BalancedDelimiterTracker T(*this, tok::l_paren);
2186 if (T.getCloseLocation().isInvalid())
2189 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2190 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2195 case tok::l_square: {
2196 // Consume the '[' and ']'.
2197 BalancedDelimiterTracker T(*this, tok::l_square);
2200 if (T.getCloseLocation().isInvalid())
2203 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2204 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2209 case tok::code_completion: {
2210 // Code completion for the operator name.
2211 Actions.CodeCompleteOperatorName(getCurScope());
2213 // Don't try to parse any further.
2221 if (Op != OO_None) {
2222 // We have parsed an operator-function-id.
2223 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations);
2227 // Parse a literal-operator-id.
2229 // literal-operator-id: C++11 [over.literal]
2230 // operator string-literal identifier
2231 // operator user-defined-string-literal
2233 if (getLangOpts().CPlusPlus11 && isTokenStringLiteral()) {
2234 Diag(Tok.getLocation(), diag::warn_cxx98_compat_literal_operator);
2236 SourceLocation DiagLoc;
2237 unsigned DiagId = 0;
2239 // We're past translation phase 6, so perform string literal concatenation
2240 // before checking for "".
2241 SmallVector<Token, 4> Toks;
2242 SmallVector<SourceLocation, 4> TokLocs;
2243 while (isTokenStringLiteral()) {
2244 if (!Tok.is(tok::string_literal) && !DiagId) {
2245 // C++11 [over.literal]p1:
2246 // The string-literal or user-defined-string-literal in a
2247 // literal-operator-id shall have no encoding-prefix [...].
2248 DiagLoc = Tok.getLocation();
2249 DiagId = diag::err_literal_operator_string_prefix;
2251 Toks.push_back(Tok);
2252 TokLocs.push_back(ConsumeStringToken());
2255 StringLiteralParser Literal(Toks, PP);
2256 if (Literal.hadError)
2259 // Grab the literal operator's suffix, which will be either the next token
2260 // or a ud-suffix from the string literal.
2261 IdentifierInfo *II = nullptr;
2262 SourceLocation SuffixLoc;
2263 if (!Literal.getUDSuffix().empty()) {
2264 II = &PP.getIdentifierTable().get(Literal.getUDSuffix());
2266 Lexer::AdvanceToTokenCharacter(TokLocs[Literal.getUDSuffixToken()],
2267 Literal.getUDSuffixOffset(),
2268 PP.getSourceManager(), getLangOpts());
2269 } else if (Tok.is(tok::identifier)) {
2270 II = Tok.getIdentifierInfo();
2271 SuffixLoc = ConsumeToken();
2272 TokLocs.push_back(SuffixLoc);
2274 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
2278 // The string literal must be empty.
2279 if (!Literal.GetString().empty() || Literal.Pascal) {
2280 // C++11 [over.literal]p1:
2281 // The string-literal or user-defined-string-literal in a
2282 // literal-operator-id shall [...] contain no characters
2283 // other than the implicit terminating '\0'.
2284 DiagLoc = TokLocs.front();
2285 DiagId = diag::err_literal_operator_string_not_empty;
2289 // This isn't a valid literal-operator-id, but we think we know
2290 // what the user meant. Tell them what they should have written.
2291 SmallString<32> Str;
2293 Str += II->getName();
2294 Diag(DiagLoc, DiagId) << FixItHint::CreateReplacement(
2295 SourceRange(TokLocs.front(), TokLocs.back()), Str);
2298 Result.setLiteralOperatorId(II, KeywordLoc, SuffixLoc);
2300 return Actions.checkLiteralOperatorId(SS, Result);
2303 // Parse a conversion-function-id.
2305 // conversion-function-id: [C++ 12.3.2]
2306 // operator conversion-type-id
2308 // conversion-type-id:
2309 // type-specifier-seq conversion-declarator[opt]
2311 // conversion-declarator:
2312 // ptr-operator conversion-declarator[opt]
2314 // Parse the type-specifier-seq.
2315 DeclSpec DS(AttrFactory);
2316 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType?
2319 // Parse the conversion-declarator, which is merely a sequence of
2321 Declarator D(DS, Declarator::ConversionIdContext);
2322 ParseDeclaratorInternal(D, /*DirectDeclParser=*/nullptr);
2324 // Finish up the type.
2325 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D);
2329 // Note that this is a conversion-function-id.
2330 Result.setConversionFunctionId(KeywordLoc, Ty.get(),
2331 D.getSourceRange().getEnd());
2335 /// \brief Parse a C++ unqualified-id (or a C identifier), which describes the
2336 /// name of an entity.
2339 /// unqualified-id: [C++ expr.prim.general]
2341 /// operator-function-id
2342 /// conversion-function-id
2343 /// [C++0x] literal-operator-id [TODO]
2349 /// \param SS The nested-name-specifier that preceded this unqualified-id. If
2350 /// non-empty, then we are parsing the unqualified-id of a qualified-id.
2352 /// \param EnteringContext whether we are entering the scope of the
2353 /// nested-name-specifier.
2355 /// \param AllowDestructorName whether we allow parsing of a destructor name.
2357 /// \param AllowConstructorName whether we allow parsing a constructor name.
2359 /// \param ObjectType if this unqualified-id occurs within a member access
2360 /// expression, the type of the base object whose member is being accessed.
2362 /// \param Result on a successful parse, contains the parsed unqualified-id.
2364 /// \returns true if parsing fails, false otherwise.
2365 bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext,
2366 bool AllowDestructorName,
2367 bool AllowConstructorName,
2368 ParsedType ObjectType,
2369 SourceLocation& TemplateKWLoc,
2370 UnqualifiedId &Result) {
2372 // Handle 'A::template B'. This is for template-ids which have not
2373 // already been annotated by ParseOptionalCXXScopeSpecifier().
2374 bool TemplateSpecified = false;
2375 if (getLangOpts().CPlusPlus && Tok.is(tok::kw_template) &&
2376 (ObjectType || SS.isSet())) {
2377 TemplateSpecified = true;
2378 TemplateKWLoc = ConsumeToken();
2383 // template-id (when it hasn't already been annotated)
2384 if (Tok.is(tok::identifier)) {
2385 // Consume the identifier.
2386 IdentifierInfo *Id = Tok.getIdentifierInfo();
2387 SourceLocation IdLoc = ConsumeToken();
2389 if (!getLangOpts().CPlusPlus) {
2390 // If we're not in C++, only identifiers matter. Record the
2391 // identifier and return.
2392 Result.setIdentifier(Id, IdLoc);
2396 if (AllowConstructorName &&
2397 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) {
2398 // We have parsed a constructor name.
2399 ParsedType Ty = Actions.getTypeName(*Id, IdLoc, getCurScope(),
2402 /*IsCtorOrDtorName=*/true,
2403 /*NonTrivialTypeSourceInfo=*/true);
2404 Result.setConstructorName(Ty, IdLoc, IdLoc);
2406 // We have parsed an identifier.
2407 Result.setIdentifier(Id, IdLoc);
2410 // If the next token is a '<', we may have a template.
2411 if (TemplateSpecified || Tok.is(tok::less))
2412 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, Id, IdLoc,
2413 EnteringContext, ObjectType,
2414 Result, TemplateSpecified);
2420 // template-id (already parsed and annotated)
2421 if (Tok.is(tok::annot_template_id)) {
2422 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2424 // If the template-name names the current class, then this is a constructor
2425 if (AllowConstructorName && TemplateId->Name &&
2426 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) {
2428 // C++ [class.qual]p2 specifies that a qualified template-name
2429 // is taken as the constructor name where a constructor can be
2430 // declared. Thus, the template arguments are extraneous, so
2431 // complain about them and remove them entirely.
2432 Diag(TemplateId->TemplateNameLoc,
2433 diag::err_out_of_line_constructor_template_id)
2435 << FixItHint::CreateRemoval(
2436 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc));
2437 ParsedType Ty = Actions.getTypeName(*TemplateId->Name,
2438 TemplateId->TemplateNameLoc,
2442 /*IsCtorOrDtorName=*/true,
2443 /*NontrivialTypeSourceInfo=*/true);
2444 Result.setConstructorName(Ty, TemplateId->TemplateNameLoc,
2445 TemplateId->RAngleLoc);
2450 Result.setConstructorTemplateId(TemplateId);
2455 // We have already parsed a template-id; consume the annotation token as
2456 // our unqualified-id.
2457 Result.setTemplateId(TemplateId);
2458 TemplateKWLoc = TemplateId->TemplateKWLoc;
2464 // operator-function-id
2465 // conversion-function-id
2466 if (Tok.is(tok::kw_operator)) {
2467 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result))
2470 // If we have an operator-function-id or a literal-operator-id and the next
2471 // token is a '<', we may have a
2474 // operator-function-id < template-argument-list[opt] >
2475 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2476 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) &&
2477 (TemplateSpecified || Tok.is(tok::less)))
2478 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2479 nullptr, SourceLocation(),
2480 EnteringContext, ObjectType,
2481 Result, TemplateSpecified);
2486 if (getLangOpts().CPlusPlus &&
2487 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) {
2488 // C++ [expr.unary.op]p10:
2489 // There is an ambiguity in the unary-expression ~X(), where X is a
2490 // class-name. The ambiguity is resolved in favor of treating ~ as a
2491 // unary complement rather than treating ~X as referring to a destructor.
2494 SourceLocation TildeLoc = ConsumeToken();
2496 if (SS.isEmpty() && Tok.is(tok::kw_decltype)) {
2497 DeclSpec DS(AttrFactory);
2498 SourceLocation EndLoc = ParseDecltypeSpecifier(DS);
2499 if (ParsedType Type = Actions.getDestructorType(DS, ObjectType)) {
2500 Result.setDestructorName(TildeLoc, Type, EndLoc);
2506 // Parse the class-name.
2507 if (Tok.isNot(tok::identifier)) {
2508 Diag(Tok, diag::err_destructor_tilde_identifier);
2512 // If the user wrote ~T::T, correct it to T::~T.
2513 DeclaratorScopeObj DeclScopeObj(*this, SS);
2514 if (!TemplateSpecified && NextToken().is(tok::coloncolon)) {
2515 // Don't let ParseOptionalCXXScopeSpecifier() "correct"
2516 // `int A; struct { ~A::A(); };` to `int A; struct { ~A:A(); };`,
2517 // it will confuse this recovery logic.
2518 ColonProtectionRAIIObject ColonRAII(*this, false);
2521 AnnotateScopeToken(SS, /*NewAnnotation*/true);
2524 if (ParseOptionalCXXScopeSpecifier(SS, ObjectType, EnteringContext))
2526 if (SS.isNotEmpty())
2527 ObjectType = ParsedType();
2528 if (Tok.isNot(tok::identifier) || NextToken().is(tok::coloncolon) ||
2530 Diag(TildeLoc, diag::err_destructor_tilde_scope);
2534 // Recover as if the tilde had been written before the identifier.
2535 Diag(TildeLoc, diag::err_destructor_tilde_scope)
2536 << FixItHint::CreateRemoval(TildeLoc)
2537 << FixItHint::CreateInsertion(Tok.getLocation(), "~");
2539 // Temporarily enter the scope for the rest of this function.
2540 if (Actions.ShouldEnterDeclaratorScope(getCurScope(), SS))
2541 DeclScopeObj.EnterDeclaratorScope();
2544 // Parse the class-name (or template-name in a simple-template-id).
2545 IdentifierInfo *ClassName = Tok.getIdentifierInfo();
2546 SourceLocation ClassNameLoc = ConsumeToken();
2548 if (TemplateSpecified || Tok.is(tok::less)) {
2549 Result.setDestructorName(TildeLoc, ParsedType(), ClassNameLoc);
2550 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2551 ClassName, ClassNameLoc,
2552 EnteringContext, ObjectType,
2553 Result, TemplateSpecified);
2556 // Note that this is a destructor name.
2557 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName,
2558 ClassNameLoc, getCurScope(),
2564 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc);
2568 Diag(Tok, diag::err_expected_unqualified_id)
2569 << getLangOpts().CPlusPlus;
2573 /// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate
2574 /// memory in a typesafe manner and call constructors.
2576 /// This method is called to parse the new expression after the optional :: has
2577 /// been already parsed. If the :: was present, "UseGlobal" is true and "Start"
2578 /// is its location. Otherwise, "Start" is the location of the 'new' token.
2581 /// '::'[opt] 'new' new-placement[opt] new-type-id
2582 /// new-initializer[opt]
2583 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2584 /// new-initializer[opt]
2587 /// '(' expression-list ')'
2590 /// type-specifier-seq new-declarator[opt]
2591 /// [GNU] attributes type-specifier-seq new-declarator[opt]
2594 /// ptr-operator new-declarator[opt]
2595 /// direct-new-declarator
2597 /// new-initializer:
2598 /// '(' expression-list[opt] ')'
2599 /// [C++0x] braced-init-list
2602 Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) {
2603 assert(Tok.is(tok::kw_new) && "expected 'new' token");
2604 ConsumeToken(); // Consume 'new'
2606 // A '(' now can be a new-placement or the '(' wrapping the type-id in the
2607 // second form of new-expression. It can't be a new-type-id.
2609 ExprVector PlacementArgs;
2610 SourceLocation PlacementLParen, PlacementRParen;
2612 SourceRange TypeIdParens;
2613 DeclSpec DS(AttrFactory);
2614 Declarator DeclaratorInfo(DS, Declarator::CXXNewContext);
2615 if (Tok.is(tok::l_paren)) {
2616 // If it turns out to be a placement, we change the type location.
2617 BalancedDelimiterTracker T(*this, tok::l_paren);
2619 PlacementLParen = T.getOpenLocation();
2620 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) {
2621 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2626 PlacementRParen = T.getCloseLocation();
2627 if (PlacementRParen.isInvalid()) {
2628 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2632 if (PlacementArgs.empty()) {
2633 // Reset the placement locations. There was no placement.
2634 TypeIdParens = T.getRange();
2635 PlacementLParen = PlacementRParen = SourceLocation();
2637 // We still need the type.
2638 if (Tok.is(tok::l_paren)) {
2639 BalancedDelimiterTracker T(*this, tok::l_paren);
2641 MaybeParseGNUAttributes(DeclaratorInfo);
2642 ParseSpecifierQualifierList(DS);
2643 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2644 ParseDeclarator(DeclaratorInfo);
2646 TypeIdParens = T.getRange();
2648 MaybeParseGNUAttributes(DeclaratorInfo);
2649 if (ParseCXXTypeSpecifierSeq(DS))
2650 DeclaratorInfo.setInvalidType(true);
2652 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2653 ParseDeclaratorInternal(DeclaratorInfo,
2654 &Parser::ParseDirectNewDeclarator);
2659 // A new-type-id is a simplified type-id, where essentially the
2660 // direct-declarator is replaced by a direct-new-declarator.
2661 MaybeParseGNUAttributes(DeclaratorInfo);
2662 if (ParseCXXTypeSpecifierSeq(DS))
2663 DeclaratorInfo.setInvalidType(true);
2665 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2666 ParseDeclaratorInternal(DeclaratorInfo,
2667 &Parser::ParseDirectNewDeclarator);
2670 if (DeclaratorInfo.isInvalidType()) {
2671 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2675 ExprResult Initializer;
2677 if (Tok.is(tok::l_paren)) {
2678 SourceLocation ConstructorLParen, ConstructorRParen;
2679 ExprVector ConstructorArgs;
2680 BalancedDelimiterTracker T(*this, tok::l_paren);
2682 ConstructorLParen = T.getOpenLocation();
2683 if (Tok.isNot(tok::r_paren)) {
2684 CommaLocsTy CommaLocs;
2685 if (ParseExpressionList(ConstructorArgs, CommaLocs, [&] {
2686 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(),
2687 DeclaratorInfo).get();
2688 Actions.CodeCompleteConstructor(getCurScope(),
2689 TypeRep.get()->getCanonicalTypeInternal(),
2690 DeclaratorInfo.getLocEnd(),
2693 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2698 ConstructorRParen = T.getCloseLocation();
2699 if (ConstructorRParen.isInvalid()) {
2700 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2703 Initializer = Actions.ActOnParenListExpr(ConstructorLParen,
2706 } else if (Tok.is(tok::l_brace) && getLangOpts().CPlusPlus11) {
2707 Diag(Tok.getLocation(),
2708 diag::warn_cxx98_compat_generalized_initializer_lists);
2709 Initializer = ParseBraceInitializer();
2711 if (Initializer.isInvalid())
2714 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen,
2715 PlacementArgs, PlacementRParen,
2716 TypeIdParens, DeclaratorInfo, Initializer.get());
2719 /// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be
2720 /// passed to ParseDeclaratorInternal.
2722 /// direct-new-declarator:
2723 /// '[' expression ']'
2724 /// direct-new-declarator '[' constant-expression ']'
2726 void Parser::ParseDirectNewDeclarator(Declarator &D) {
2727 // Parse the array dimensions.
2729 while (Tok.is(tok::l_square)) {
2730 // An array-size expression can't start with a lambda.
2731 if (CheckProhibitedCXX11Attribute())
2734 BalancedDelimiterTracker T(*this, tok::l_square);
2737 ExprResult Size(first ? ParseExpression()
2738 : ParseConstantExpression());
2739 if (Size.isInvalid()) {
2741 SkipUntil(tok::r_square, StopAtSemi);
2748 // Attributes here appertain to the array type. C++11 [expr.new]p5.
2749 ParsedAttributes Attrs(AttrFactory);
2750 MaybeParseCXX11Attributes(Attrs);
2752 D.AddTypeInfo(DeclaratorChunk::getArray(0,
2753 /*static=*/false, /*star=*/false,
2755 T.getOpenLocation(),
2756 T.getCloseLocation()),
2757 Attrs, T.getCloseLocation());
2759 if (T.getCloseLocation().isInvalid())
2764 /// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id.
2765 /// This ambiguity appears in the syntax of the C++ new operator.
2768 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2769 /// new-initializer[opt]
2772 /// '(' expression-list ')'
2774 bool Parser::ParseExpressionListOrTypeId(
2775 SmallVectorImpl<Expr*> &PlacementArgs,
2777 // The '(' was already consumed.
2778 if (isTypeIdInParens()) {
2779 ParseSpecifierQualifierList(D.getMutableDeclSpec());
2780 D.SetSourceRange(D.getDeclSpec().getSourceRange());
2782 return D.isInvalidType();
2785 // It's not a type, it has to be an expression list.
2786 // Discard the comma locations - ActOnCXXNew has enough parameters.
2787 CommaLocsTy CommaLocs;
2788 return ParseExpressionList(PlacementArgs, CommaLocs);
2791 /// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used
2792 /// to free memory allocated by new.
2794 /// This method is called to parse the 'delete' expression after the optional
2795 /// '::' has been already parsed. If the '::' was present, "UseGlobal" is true
2796 /// and "Start" is its location. Otherwise, "Start" is the location of the
2799 /// delete-expression:
2800 /// '::'[opt] 'delete' cast-expression
2801 /// '::'[opt] 'delete' '[' ']' cast-expression
2803 Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) {
2804 assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword");
2805 ConsumeToken(); // Consume 'delete'
2808 bool ArrayDelete = false;
2809 if (Tok.is(tok::l_square) && NextToken().is(tok::r_square)) {
2810 // C++11 [expr.delete]p1:
2811 // Whenever the delete keyword is followed by empty square brackets, it
2812 // shall be interpreted as [array delete].
2813 // [Footnote: A lambda expression with a lambda-introducer that consists
2814 // of empty square brackets can follow the delete keyword if
2815 // the lambda expression is enclosed in parentheses.]
2816 // FIXME: Produce a better diagnostic if the '[]' is unambiguously a
2817 // lambda-introducer.
2819 BalancedDelimiterTracker T(*this, tok::l_square);
2823 if (T.getCloseLocation().isInvalid())
2827 ExprResult Operand(ParseCastExpression(false));
2828 if (Operand.isInvalid())
2831 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.get());
2834 static TypeTrait TypeTraitFromTokKind(tok::TokenKind kind) {
2836 default: llvm_unreachable("Not a known type trait");
2837 #define TYPE_TRAIT_1(Spelling, Name, Key) \
2838 case tok::kw_ ## Spelling: return UTT_ ## Name;
2839 #define TYPE_TRAIT_2(Spelling, Name, Key) \
2840 case tok::kw_ ## Spelling: return BTT_ ## Name;
2841 #include "clang/Basic/TokenKinds.def"
2842 #define TYPE_TRAIT_N(Spelling, Name, Key) \
2843 case tok::kw_ ## Spelling: return TT_ ## Name;
2844 #include "clang/Basic/TokenKinds.def"
2848 static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) {
2850 default: llvm_unreachable("Not a known binary type trait");
2851 case tok::kw___array_rank: return ATT_ArrayRank;
2852 case tok::kw___array_extent: return ATT_ArrayExtent;
2856 static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) {
2858 default: llvm_unreachable("Not a known unary expression trait.");
2859 case tok::kw___is_lvalue_expr: return ET_IsLValueExpr;
2860 case tok::kw___is_rvalue_expr: return ET_IsRValueExpr;
2864 static unsigned TypeTraitArity(tok::TokenKind kind) {
2866 default: llvm_unreachable("Not a known type trait");
2867 #define TYPE_TRAIT(N,Spelling,K) case tok::kw_##Spelling: return N;
2868 #include "clang/Basic/TokenKinds.def"
2872 /// \brief Parse the built-in type-trait pseudo-functions that allow
2873 /// implementation of the TR1/C++11 type traits templates.
2875 /// primary-expression:
2876 /// unary-type-trait '(' type-id ')'
2877 /// binary-type-trait '(' type-id ',' type-id ')'
2878 /// type-trait '(' type-id-seq ')'
2881 /// type-id ...[opt] type-id-seq[opt]
2883 ExprResult Parser::ParseTypeTrait() {
2884 tok::TokenKind Kind = Tok.getKind();
2885 unsigned Arity = TypeTraitArity(Kind);
2887 SourceLocation Loc = ConsumeToken();
2889 BalancedDelimiterTracker Parens(*this, tok::l_paren);
2890 if (Parens.expectAndConsume())
2893 SmallVector<ParsedType, 2> Args;
2895 // Parse the next type.
2896 TypeResult Ty = ParseTypeName();
2897 if (Ty.isInvalid()) {
2902 // Parse the ellipsis, if present.
2903 if (Tok.is(tok::ellipsis)) {
2904 Ty = Actions.ActOnPackExpansion(Ty.get(), ConsumeToken());
2905 if (Ty.isInvalid()) {
2911 // Add this type to the list of arguments.
2912 Args.push_back(Ty.get());
2913 } while (TryConsumeToken(tok::comma));
2915 if (Parens.consumeClose())
2918 SourceLocation EndLoc = Parens.getCloseLocation();
2920 if (Arity && Args.size() != Arity) {
2921 Diag(EndLoc, diag::err_type_trait_arity)
2922 << Arity << 0 << (Arity > 1) << (int)Args.size() << SourceRange(Loc);
2926 if (!Arity && Args.empty()) {
2927 Diag(EndLoc, diag::err_type_trait_arity)
2928 << 1 << 1 << 1 << (int)Args.size() << SourceRange(Loc);
2932 return Actions.ActOnTypeTrait(TypeTraitFromTokKind(Kind), Loc, Args, EndLoc);
2935 /// ParseArrayTypeTrait - Parse the built-in array type-trait
2936 /// pseudo-functions.
2938 /// primary-expression:
2939 /// [Embarcadero] '__array_rank' '(' type-id ')'
2940 /// [Embarcadero] '__array_extent' '(' type-id ',' expression ')'
2942 ExprResult Parser::ParseArrayTypeTrait() {
2943 ArrayTypeTrait ATT = ArrayTypeTraitFromTokKind(Tok.getKind());
2944 SourceLocation Loc = ConsumeToken();
2946 BalancedDelimiterTracker T(*this, tok::l_paren);
2947 if (T.expectAndConsume())
2950 TypeResult Ty = ParseTypeName();
2951 if (Ty.isInvalid()) {
2952 SkipUntil(tok::comma, StopAtSemi);
2953 SkipUntil(tok::r_paren, StopAtSemi);
2958 case ATT_ArrayRank: {
2960 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), nullptr,
2961 T.getCloseLocation());
2963 case ATT_ArrayExtent: {
2964 if (ExpectAndConsume(tok::comma)) {
2965 SkipUntil(tok::r_paren, StopAtSemi);
2969 ExprResult DimExpr = ParseExpression();
2972 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), DimExpr.get(),
2973 T.getCloseLocation());
2976 llvm_unreachable("Invalid ArrayTypeTrait!");
2979 /// ParseExpressionTrait - Parse built-in expression-trait
2980 /// pseudo-functions like __is_lvalue_expr( xxx ).
2982 /// primary-expression:
2983 /// [Embarcadero] expression-trait '(' expression ')'
2985 ExprResult Parser::ParseExpressionTrait() {
2986 ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind());
2987 SourceLocation Loc = ConsumeToken();
2989 BalancedDelimiterTracker T(*this, tok::l_paren);
2990 if (T.expectAndConsume())
2993 ExprResult Expr = ParseExpression();
2997 return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(),
2998 T.getCloseLocation());
3002 /// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a
3003 /// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate
3004 /// based on the context past the parens.
3006 Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType,
3008 BalancedDelimiterTracker &Tracker,
3009 ColonProtectionRAIIObject &ColonProt) {
3010 assert(getLangOpts().CPlusPlus && "Should only be called for C++!");
3011 assert(ExprType == CastExpr && "Compound literals are not ambiguous!");
3012 assert(isTypeIdInParens() && "Not a type-id!");
3014 ExprResult Result(true);
3015 CastTy = ParsedType();
3017 // We need to disambiguate a very ugly part of the C++ syntax:
3019 // (T())x; - type-id
3020 // (T())*x; - type-id
3021 // (T())/x; - expression
3022 // (T()); - expression
3024 // The bad news is that we cannot use the specialized tentative parser, since
3025 // it can only verify that the thing inside the parens can be parsed as
3026 // type-id, it is not useful for determining the context past the parens.
3028 // The good news is that the parser can disambiguate this part without
3029 // making any unnecessary Action calls.
3031 // It uses a scheme similar to parsing inline methods. The parenthesized
3032 // tokens are cached, the context that follows is determined (possibly by
3033 // parsing a cast-expression), and then we re-introduce the cached tokens
3034 // into the token stream and parse them appropriately.
3036 ParenParseOption ParseAs;
3039 // Store the tokens of the parentheses. We will parse them after we determine
3040 // the context that follows them.
3041 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) {
3042 // We didn't find the ')' we expected.
3043 Tracker.consumeClose();
3047 if (Tok.is(tok::l_brace)) {
3048 ParseAs = CompoundLiteral;
3051 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) {
3054 // Try parsing the cast-expression that may follow.
3055 // If it is not a cast-expression, NotCastExpr will be true and no token
3056 // will be consumed.
3057 ColonProt.restore();
3058 Result = ParseCastExpression(false/*isUnaryExpression*/,
3059 false/*isAddressofOperand*/,
3061 // type-id has priority.
3065 // If we parsed a cast-expression, it's really a type-id, otherwise it's
3067 ParseAs = NotCastExpr ? SimpleExpr : CastExpr;
3070 // The current token should go after the cached tokens.
3071 Toks.push_back(Tok);
3072 // Re-enter the stored parenthesized tokens into the token stream, so we may
3074 PP.EnterTokenStream(Toks.data(), Toks.size(),
3075 true/*DisableMacroExpansion*/, false/*OwnsTokens*/);
3076 // Drop the current token and bring the first cached one. It's the same token
3077 // as when we entered this function.
3080 if (ParseAs >= CompoundLiteral) {
3081 // Parse the type declarator.
3082 DeclSpec DS(AttrFactory);
3083 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
3085 ColonProtectionRAIIObject InnerColonProtection(*this);
3086 ParseSpecifierQualifierList(DS);
3087 ParseDeclarator(DeclaratorInfo);
3091 Tracker.consumeClose();
3092 ColonProt.restore();
3094 if (ParseAs == CompoundLiteral) {
3095 ExprType = CompoundLiteral;
3096 if (DeclaratorInfo.isInvalidType())
3099 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
3100 return ParseCompoundLiteralExpression(Ty.get(),
3101 Tracker.getOpenLocation(),
3102 Tracker.getCloseLocation());
3105 // We parsed '(' type-id ')' and the thing after it wasn't a '{'.
3106 assert(ParseAs == CastExpr);
3108 if (DeclaratorInfo.isInvalidType())
3111 // Result is what ParseCastExpression returned earlier.
3112 if (!Result.isInvalid())
3113 Result = Actions.ActOnCastExpr(getCurScope(), Tracker.getOpenLocation(),
3114 DeclaratorInfo, CastTy,
3115 Tracker.getCloseLocation(), Result.get());
3119 // Not a compound literal, and not followed by a cast-expression.
3120 assert(ParseAs == SimpleExpr);
3122 ExprType = SimpleExpr;
3123 Result = ParseExpression();
3124 if (!Result.isInvalid() && Tok.is(tok::r_paren))
3125 Result = Actions.ActOnParenExpr(Tracker.getOpenLocation(),
3126 Tok.getLocation(), Result.get());
3129 if (Result.isInvalid()) {
3130 SkipUntil(tok::r_paren, StopAtSemi);
3134 Tracker.consumeClose();