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.is(tok::kw_decltype) || Tok.is(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.is(tok::coloncolon) || Tok.is(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.is(tok::l_brace) || Tok.is(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.is(tok::kw_mutable) || Tok.is(tok::arrow) ||
1163 Tok.is(tok::kw___attribute) ||
1164 (Tok.is(tok::l_square) && NextToken().is(tok::l_square))) {
1165 // It's common to forget that one needs '()' before 'mutable', an attribute
1166 // specifier, or the result type. Deal with this.
1167 unsigned TokKind = 0;
1168 switch (Tok.getKind()) {
1169 case tok::kw_mutable: TokKind = 0; break;
1170 case tok::arrow: TokKind = 1; break;
1171 case tok::kw___attribute:
1172 case tok::l_square: TokKind = 2; break;
1173 default: llvm_unreachable("Unknown token kind");
1176 Diag(Tok, diag::err_lambda_missing_parens)
1178 << FixItHint::CreateInsertion(Tok.getLocation(), "() ");
1179 SourceLocation DeclLoc = Tok.getLocation();
1180 SourceLocation DeclEndLoc = DeclLoc;
1182 // GNU-style attributes must be parsed before the mutable specifier to be
1183 // compatible with GCC.
1184 ParsedAttributes Attr(AttrFactory);
1185 MaybeParseGNUAttributes(Attr, &DeclEndLoc);
1187 // Parse 'mutable', if it's there.
1188 SourceLocation MutableLoc;
1189 if (Tok.is(tok::kw_mutable)) {
1190 MutableLoc = ConsumeToken();
1191 DeclEndLoc = MutableLoc;
1194 // Parse attribute-specifier[opt].
1195 MaybeParseCXX11Attributes(Attr, &DeclEndLoc);
1197 // Parse the return type, if there is one.
1198 if (Tok.is(tok::arrow)) {
1200 TrailingReturnType = ParseTrailingReturnType(Range);
1201 if (Range.getEnd().isValid())
1202 DeclEndLoc = Range.getEnd();
1205 SourceLocation NoLoc;
1206 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true,
1207 /*isAmbiguous=*/false,
1208 /*LParenLoc=*/NoLoc,
1211 /*EllipsisLoc=*/NoLoc,
1212 /*RParenLoc=*/NoLoc,
1214 /*RefQualifierIsLValueRef=*/true,
1215 /*RefQualifierLoc=*/NoLoc,
1216 /*ConstQualifierLoc=*/NoLoc,
1217 /*VolatileQualifierLoc=*/NoLoc,
1218 /*RestrictQualifierLoc=*/NoLoc,
1222 /*Exceptions=*/nullptr,
1223 /*ExceptionRanges=*/nullptr,
1224 /*NumExceptions=*/0,
1225 /*NoexceptExpr=*/nullptr,
1226 /*ExceptionSpecTokens=*/nullptr,
1227 DeclLoc, DeclEndLoc, D,
1228 TrailingReturnType),
1233 // FIXME: Rename BlockScope -> ClosureScope if we decide to continue using
1235 unsigned ScopeFlags = Scope::BlockScope | Scope::FnScope | Scope::DeclScope;
1236 ParseScope BodyScope(this, ScopeFlags);
1238 Actions.ActOnStartOfLambdaDefinition(Intro, D, getCurScope());
1240 // Parse compound-statement.
1241 if (!Tok.is(tok::l_brace)) {
1242 Diag(Tok, diag::err_expected_lambda_body);
1243 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope());
1247 StmtResult Stmt(ParseCompoundStatementBody());
1250 if (!Stmt.isInvalid() && !TrailingReturnType.isInvalid())
1251 return Actions.ActOnLambdaExpr(LambdaBeginLoc, Stmt.get(), getCurScope());
1253 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope());
1257 /// ParseCXXCasts - This handles the various ways to cast expressions to another
1260 /// postfix-expression: [C++ 5.2p1]
1261 /// 'dynamic_cast' '<' type-name '>' '(' expression ')'
1262 /// 'static_cast' '<' type-name '>' '(' expression ')'
1263 /// 'reinterpret_cast' '<' type-name '>' '(' expression ')'
1264 /// 'const_cast' '<' type-name '>' '(' expression ')'
1266 ExprResult Parser::ParseCXXCasts() {
1267 tok::TokenKind Kind = Tok.getKind();
1268 const char *CastName = nullptr; // For error messages
1271 default: llvm_unreachable("Unknown C++ cast!");
1272 case tok::kw_const_cast: CastName = "const_cast"; break;
1273 case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break;
1274 case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break;
1275 case tok::kw_static_cast: CastName = "static_cast"; break;
1278 SourceLocation OpLoc = ConsumeToken();
1279 SourceLocation LAngleBracketLoc = Tok.getLocation();
1281 // Check for "<::" which is parsed as "[:". If found, fix token stream,
1282 // diagnose error, suggest fix, and recover parsing.
1283 if (Tok.is(tok::l_square) && Tok.getLength() == 2) {
1284 Token Next = NextToken();
1285 if (Next.is(tok::colon) && areTokensAdjacent(Tok, Next))
1286 FixDigraph(*this, PP, Tok, Next, Kind, /*AtDigraph*/true);
1289 if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName))
1292 // Parse the common declaration-specifiers piece.
1293 DeclSpec DS(AttrFactory);
1294 ParseSpecifierQualifierList(DS);
1296 // Parse the abstract-declarator, if present.
1297 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1298 ParseDeclarator(DeclaratorInfo);
1300 SourceLocation RAngleBracketLoc = Tok.getLocation();
1302 if (ExpectAndConsume(tok::greater))
1303 return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << tok::less);
1305 SourceLocation LParenLoc, RParenLoc;
1306 BalancedDelimiterTracker T(*this, tok::l_paren);
1308 if (T.expectAndConsume(diag::err_expected_lparen_after, CastName))
1311 ExprResult Result = ParseExpression();
1316 if (!Result.isInvalid() && !DeclaratorInfo.isInvalidType())
1317 Result = Actions.ActOnCXXNamedCast(OpLoc, Kind,
1318 LAngleBracketLoc, DeclaratorInfo,
1320 T.getOpenLocation(), Result.get(),
1321 T.getCloseLocation());
1326 /// ParseCXXTypeid - This handles the C++ typeid expression.
1328 /// postfix-expression: [C++ 5.2p1]
1329 /// 'typeid' '(' expression ')'
1330 /// 'typeid' '(' type-id ')'
1332 ExprResult Parser::ParseCXXTypeid() {
1333 assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!");
1335 SourceLocation OpLoc = ConsumeToken();
1336 SourceLocation LParenLoc, RParenLoc;
1337 BalancedDelimiterTracker T(*this, tok::l_paren);
1339 // typeid expressions are always parenthesized.
1340 if (T.expectAndConsume(diag::err_expected_lparen_after, "typeid"))
1342 LParenLoc = T.getOpenLocation();
1346 // C++0x [expr.typeid]p3:
1347 // When typeid is applied to an expression other than an lvalue of a
1348 // polymorphic class type [...] The expression is an unevaluated
1349 // operand (Clause 5).
1351 // Note that we can't tell whether the expression is an lvalue of a
1352 // polymorphic class type until after we've parsed the expression; we
1353 // speculatively assume the subexpression is unevaluated, and fix it up
1356 // We enter the unevaluated context before trying to determine whether we
1357 // have a type-id, because the tentative parse logic will try to resolve
1358 // names, and must treat them as unevaluated.
1359 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
1360 Sema::ReuseLambdaContextDecl);
1362 if (isTypeIdInParens()) {
1363 TypeResult Ty = ParseTypeName();
1367 RParenLoc = T.getCloseLocation();
1368 if (Ty.isInvalid() || RParenLoc.isInvalid())
1371 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true,
1372 Ty.get().getAsOpaquePtr(), RParenLoc);
1374 Result = ParseExpression();
1377 if (Result.isInvalid())
1378 SkipUntil(tok::r_paren, StopAtSemi);
1381 RParenLoc = T.getCloseLocation();
1382 if (RParenLoc.isInvalid())
1385 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false,
1386 Result.get(), RParenLoc);
1393 /// ParseCXXUuidof - This handles the Microsoft C++ __uuidof expression.
1395 /// '__uuidof' '(' expression ')'
1396 /// '__uuidof' '(' type-id ')'
1398 ExprResult Parser::ParseCXXUuidof() {
1399 assert(Tok.is(tok::kw___uuidof) && "Not '__uuidof'!");
1401 SourceLocation OpLoc = ConsumeToken();
1402 BalancedDelimiterTracker T(*this, tok::l_paren);
1404 // __uuidof expressions are always parenthesized.
1405 if (T.expectAndConsume(diag::err_expected_lparen_after, "__uuidof"))
1410 if (isTypeIdInParens()) {
1411 TypeResult Ty = ParseTypeName();
1419 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), /*isType=*/true,
1420 Ty.get().getAsOpaquePtr(),
1421 T.getCloseLocation());
1423 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
1424 Result = ParseExpression();
1427 if (Result.isInvalid())
1428 SkipUntil(tok::r_paren, StopAtSemi);
1432 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(),
1434 Result.get(), T.getCloseLocation());
1441 /// \brief Parse a C++ pseudo-destructor expression after the base,
1442 /// . or -> operator, and nested-name-specifier have already been
1445 /// postfix-expression: [C++ 5.2]
1446 /// postfix-expression . pseudo-destructor-name
1447 /// postfix-expression -> pseudo-destructor-name
1449 /// pseudo-destructor-name:
1450 /// ::[opt] nested-name-specifier[opt] type-name :: ~type-name
1451 /// ::[opt] nested-name-specifier template simple-template-id ::
1453 /// ::[opt] nested-name-specifier[opt] ~type-name
1456 Parser::ParseCXXPseudoDestructor(Expr *Base, SourceLocation OpLoc,
1457 tok::TokenKind OpKind,
1459 ParsedType ObjectType) {
1460 // We're parsing either a pseudo-destructor-name or a dependent
1461 // member access that has the same form as a
1462 // pseudo-destructor-name. We parse both in the same way and let
1463 // the action model sort them out.
1465 // Note that the ::[opt] nested-name-specifier[opt] has already
1466 // been parsed, and if there was a simple-template-id, it has
1467 // been coalesced into a template-id annotation token.
1468 UnqualifiedId FirstTypeName;
1469 SourceLocation CCLoc;
1470 if (Tok.is(tok::identifier)) {
1471 FirstTypeName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1473 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail");
1474 CCLoc = ConsumeToken();
1475 } else if (Tok.is(tok::annot_template_id)) {
1476 // FIXME: retrieve TemplateKWLoc from template-id annotation and
1477 // store it in the pseudo-dtor node (to be used when instantiating it).
1478 FirstTypeName.setTemplateId(
1479 (TemplateIdAnnotation *)Tok.getAnnotationValue());
1481 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail");
1482 CCLoc = ConsumeToken();
1484 FirstTypeName.setIdentifier(nullptr, SourceLocation());
1488 assert(Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail");
1489 SourceLocation TildeLoc = ConsumeToken();
1491 if (Tok.is(tok::kw_decltype) && !FirstTypeName.isValid() && SS.isEmpty()) {
1492 DeclSpec DS(AttrFactory);
1493 ParseDecltypeSpecifier(DS);
1494 if (DS.getTypeSpecType() == TST_error)
1496 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, OpKind,
1500 if (!Tok.is(tok::identifier)) {
1501 Diag(Tok, diag::err_destructor_tilde_identifier);
1505 // Parse the second type.
1506 UnqualifiedId SecondTypeName;
1507 IdentifierInfo *Name = Tok.getIdentifierInfo();
1508 SourceLocation NameLoc = ConsumeToken();
1509 SecondTypeName.setIdentifier(Name, NameLoc);
1511 // If there is a '<', the second type name is a template-id. Parse
1513 if (Tok.is(tok::less) &&
1514 ParseUnqualifiedIdTemplateId(SS, SourceLocation(),
1516 false, ObjectType, SecondTypeName,
1517 /*AssumeTemplateName=*/true))
1520 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, OpKind,
1521 SS, FirstTypeName, CCLoc, TildeLoc,
1525 /// ParseCXXBoolLiteral - This handles the C++ Boolean literals.
1527 /// boolean-literal: [C++ 2.13.5]
1530 ExprResult Parser::ParseCXXBoolLiteral() {
1531 tok::TokenKind Kind = Tok.getKind();
1532 return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind);
1535 /// ParseThrowExpression - This handles the C++ throw expression.
1537 /// throw-expression: [C++ 15]
1538 /// 'throw' assignment-expression[opt]
1539 ExprResult Parser::ParseThrowExpression() {
1540 assert(Tok.is(tok::kw_throw) && "Not throw!");
1541 SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token.
1543 // If the current token isn't the start of an assignment-expression,
1544 // then the expression is not present. This handles things like:
1545 // "C ? throw : (void)42", which is crazy but legal.
1546 switch (Tok.getKind()) { // FIXME: move this predicate somewhere common.
1553 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, nullptr);
1556 ExprResult Expr(ParseAssignmentExpression());
1557 if (Expr.isInvalid()) return Expr;
1558 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, Expr.get());
1562 /// ParseCXXThis - This handles the C++ 'this' pointer.
1564 /// C++ 9.3.2: In the body of a non-static member function, the keyword this is
1565 /// a non-lvalue expression whose value is the address of the object for which
1566 /// the function is called.
1567 ExprResult Parser::ParseCXXThis() {
1568 assert(Tok.is(tok::kw_this) && "Not 'this'!");
1569 SourceLocation ThisLoc = ConsumeToken();
1570 return Actions.ActOnCXXThis(ThisLoc);
1573 /// ParseCXXTypeConstructExpression - Parse construction of a specified type.
1574 /// Can be interpreted either as function-style casting ("int(x)")
1575 /// or class type construction ("ClassType(x,y,z)")
1576 /// or creation of a value-initialized type ("int()").
1577 /// See [C++ 5.2.3].
1579 /// postfix-expression: [C++ 5.2p1]
1580 /// simple-type-specifier '(' expression-list[opt] ')'
1581 /// [C++0x] simple-type-specifier braced-init-list
1582 /// typename-specifier '(' expression-list[opt] ')'
1583 /// [C++0x] typename-specifier braced-init-list
1586 Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) {
1587 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1588 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo).get();
1590 assert((Tok.is(tok::l_paren) ||
1591 (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)))
1592 && "Expected '(' or '{'!");
1594 if (Tok.is(tok::l_brace)) {
1595 ExprResult Init = ParseBraceInitializer();
1596 if (Init.isInvalid())
1598 Expr *InitList = Init.get();
1599 return Actions.ActOnCXXTypeConstructExpr(TypeRep, SourceLocation(),
1600 MultiExprArg(&InitList, 1),
1603 BalancedDelimiterTracker T(*this, tok::l_paren);
1607 CommaLocsTy CommaLocs;
1609 if (Tok.isNot(tok::r_paren)) {
1610 if (ParseExpressionList(Exprs, CommaLocs, [&] {
1611 Actions.CodeCompleteConstructor(getCurScope(),
1612 TypeRep.get()->getCanonicalTypeInternal(),
1613 DS.getLocEnd(), Exprs);
1615 SkipUntil(tok::r_paren, StopAtSemi);
1623 // TypeRep could be null, if it references an invalid typedef.
1627 assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&&
1628 "Unexpected number of commas!");
1629 return Actions.ActOnCXXTypeConstructExpr(TypeRep, T.getOpenLocation(),
1631 T.getCloseLocation());
1635 /// ParseCXXCondition - if/switch/while condition expression.
1639 /// type-specifier-seq declarator '=' assignment-expression
1640 /// [C++11] type-specifier-seq declarator '=' initializer-clause
1641 /// [C++11] type-specifier-seq declarator braced-init-list
1642 /// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt]
1643 /// '=' assignment-expression
1645 /// \param ExprOut if the condition was parsed as an expression, the parsed
1648 /// \param DeclOut if the condition was parsed as a declaration, the parsed
1651 /// \param Loc The location of the start of the statement that requires this
1652 /// condition, e.g., the "for" in a for loop.
1654 /// \param ConvertToBoolean Whether the condition expression should be
1655 /// converted to a boolean value.
1657 /// \returns true if there was a parsing, false otherwise.
1658 bool Parser::ParseCXXCondition(ExprResult &ExprOut,
1661 bool ConvertToBoolean) {
1662 if (Tok.is(tok::code_completion)) {
1663 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition);
1668 ParsedAttributesWithRange attrs(AttrFactory);
1669 MaybeParseCXX11Attributes(attrs);
1671 if (!isCXXConditionDeclaration()) {
1672 ProhibitAttributes(attrs);
1674 // Parse the expression.
1675 ExprOut = ParseExpression(); // expression
1677 if (ExprOut.isInvalid())
1680 // If required, convert to a boolean value.
1681 if (ConvertToBoolean)
1683 = Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprOut.get());
1684 return ExprOut.isInvalid();
1687 // type-specifier-seq
1688 DeclSpec DS(AttrFactory);
1689 DS.takeAttributesFrom(attrs);
1690 ParseSpecifierQualifierList(DS);
1693 Declarator DeclaratorInfo(DS, Declarator::ConditionContext);
1694 ParseDeclarator(DeclaratorInfo);
1696 // simple-asm-expr[opt]
1697 if (Tok.is(tok::kw_asm)) {
1699 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1700 if (AsmLabel.isInvalid()) {
1701 SkipUntil(tok::semi, StopAtSemi);
1704 DeclaratorInfo.setAsmLabel(AsmLabel.get());
1705 DeclaratorInfo.SetRangeEnd(Loc);
1708 // If attributes are present, parse them.
1709 MaybeParseGNUAttributes(DeclaratorInfo);
1711 // Type-check the declaration itself.
1712 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(),
1714 DeclOut = Dcl.get();
1715 ExprOut = ExprError();
1717 // '=' assignment-expression
1718 // If a '==' or '+=' is found, suggest a fixit to '='.
1719 bool CopyInitialization = isTokenEqualOrEqualTypo();
1720 if (CopyInitialization)
1723 ExprResult InitExpr = ExprError();
1724 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1725 Diag(Tok.getLocation(),
1726 diag::warn_cxx98_compat_generalized_initializer_lists);
1727 InitExpr = ParseBraceInitializer();
1728 } else if (CopyInitialization) {
1729 InitExpr = ParseAssignmentExpression();
1730 } else if (Tok.is(tok::l_paren)) {
1731 // This was probably an attempt to initialize the variable.
1732 SourceLocation LParen = ConsumeParen(), RParen = LParen;
1733 if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch))
1734 RParen = ConsumeParen();
1735 Diag(DeclOut ? DeclOut->getLocation() : LParen,
1736 diag::err_expected_init_in_condition_lparen)
1737 << SourceRange(LParen, RParen);
1739 Diag(DeclOut ? DeclOut->getLocation() : Tok.getLocation(),
1740 diag::err_expected_init_in_condition);
1743 if (!InitExpr.isInvalid())
1744 Actions.AddInitializerToDecl(DeclOut, InitExpr.get(), !CopyInitialization,
1745 DS.containsPlaceholderType());
1747 Actions.ActOnInitializerError(DeclOut);
1749 // FIXME: Build a reference to this declaration? Convert it to bool?
1750 // (This is currently handled by Sema).
1752 Actions.FinalizeDeclaration(DeclOut);
1757 /// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers.
1758 /// This should only be called when the current token is known to be part of
1759 /// simple-type-specifier.
1761 /// simple-type-specifier:
1762 /// '::'[opt] nested-name-specifier[opt] type-name
1763 /// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO]
1775 /// [GNU] typeof-specifier
1776 /// [C++0x] auto [TODO]
1783 void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) {
1784 DS.SetRangeStart(Tok.getLocation());
1785 const char *PrevSpec;
1787 SourceLocation Loc = Tok.getLocation();
1788 const clang::PrintingPolicy &Policy =
1789 Actions.getASTContext().getPrintingPolicy();
1791 switch (Tok.getKind()) {
1792 case tok::identifier: // foo::bar
1793 case tok::coloncolon: // ::foo::bar
1794 llvm_unreachable("Annotation token should already be formed!");
1796 llvm_unreachable("Not a simple-type-specifier token!");
1799 case tok::annot_typename: {
1800 if (getTypeAnnotation(Tok))
1801 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID,
1802 getTypeAnnotation(Tok), Policy);
1804 DS.SetTypeSpecError();
1806 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1809 // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id'
1810 // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an
1811 // Objective-C interface. If we don't have Objective-C or a '<', this is
1812 // just a normal reference to a typedef name.
1813 if (Tok.is(tok::less) && getLangOpts().ObjC1)
1814 ParseObjCProtocolQualifiers(DS);
1816 DS.Finish(Diags, PP, Policy);
1822 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID, Policy);
1825 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID, Policy);
1827 case tok::kw___int64:
1828 DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, DiagID, Policy);
1830 case tok::kw_signed:
1831 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID);
1833 case tok::kw_unsigned:
1834 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID);
1837 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID, Policy);
1840 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID, Policy);
1843 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID, Policy);
1845 case tok::kw___int128:
1846 DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec, DiagID, Policy);
1849 DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, DiagID, Policy);
1852 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID, Policy);
1854 case tok::kw_double:
1855 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID, Policy);
1857 case tok::kw_wchar_t:
1858 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID, Policy);
1860 case tok::kw_char16_t:
1861 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID, Policy);
1863 case tok::kw_char32_t:
1864 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID, Policy);
1867 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID, Policy);
1869 case tok::annot_decltype:
1870 case tok::kw_decltype:
1871 DS.SetRangeEnd(ParseDecltypeSpecifier(DS));
1872 return DS.Finish(Diags, PP, Policy);
1874 // GNU typeof support.
1875 case tok::kw_typeof:
1876 ParseTypeofSpecifier(DS);
1877 DS.Finish(Diags, PP, Policy);
1880 if (Tok.is(tok::annot_typename))
1881 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1883 DS.SetRangeEnd(Tok.getLocation());
1885 DS.Finish(Diags, PP, Policy);
1888 /// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++
1889 /// [dcl.name]), which is a non-empty sequence of type-specifiers,
1890 /// e.g., "const short int". Note that the DeclSpec is *not* finished
1891 /// by parsing the type-specifier-seq, because these sequences are
1892 /// typically followed by some form of declarator. Returns true and
1893 /// emits diagnostics if this is not a type-specifier-seq, false
1896 /// type-specifier-seq: [C++ 8.1]
1897 /// type-specifier type-specifier-seq[opt]
1899 bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) {
1900 ParseSpecifierQualifierList(DS, AS_none, DSC_type_specifier);
1901 DS.Finish(Diags, PP, Actions.getASTContext().getPrintingPolicy());
1905 /// \brief Finish parsing a C++ unqualified-id that is a template-id of
1908 /// This routine is invoked when a '<' is encountered after an identifier or
1909 /// operator-function-id is parsed by \c ParseUnqualifiedId() to determine
1910 /// whether the unqualified-id is actually a template-id. This routine will
1911 /// then parse the template arguments and form the appropriate template-id to
1912 /// return to the caller.
1914 /// \param SS the nested-name-specifier that precedes this template-id, if
1915 /// we're actually parsing a qualified-id.
1917 /// \param Name for constructor and destructor names, this is the actual
1918 /// identifier that may be a template-name.
1920 /// \param NameLoc the location of the class-name in a constructor or
1923 /// \param EnteringContext whether we're entering the scope of the
1924 /// nested-name-specifier.
1926 /// \param ObjectType if this unqualified-id occurs within a member access
1927 /// expression, the type of the base object whose member is being accessed.
1929 /// \param Id as input, describes the template-name or operator-function-id
1930 /// that precedes the '<'. If template arguments were parsed successfully,
1931 /// will be updated with the template-id.
1933 /// \param AssumeTemplateId When true, this routine will assume that the name
1934 /// refers to a template without performing name lookup to verify.
1936 /// \returns true if a parse error occurred, false otherwise.
1937 bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS,
1938 SourceLocation TemplateKWLoc,
1939 IdentifierInfo *Name,
1940 SourceLocation NameLoc,
1941 bool EnteringContext,
1942 ParsedType ObjectType,
1944 bool AssumeTemplateId) {
1945 assert((AssumeTemplateId || Tok.is(tok::less)) &&
1946 "Expected '<' to finish parsing a template-id");
1948 TemplateTy Template;
1949 TemplateNameKind TNK = TNK_Non_template;
1950 switch (Id.getKind()) {
1951 case UnqualifiedId::IK_Identifier:
1952 case UnqualifiedId::IK_OperatorFunctionId:
1953 case UnqualifiedId::IK_LiteralOperatorId:
1954 if (AssumeTemplateId) {
1955 TNK = Actions.ActOnDependentTemplateName(getCurScope(), SS, TemplateKWLoc,
1956 Id, ObjectType, EnteringContext,
1958 if (TNK == TNK_Non_template)
1961 bool MemberOfUnknownSpecialization;
1962 TNK = Actions.isTemplateName(getCurScope(), SS,
1963 TemplateKWLoc.isValid(), Id,
1964 ObjectType, EnteringContext, Template,
1965 MemberOfUnknownSpecialization);
1967 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization &&
1968 ObjectType && IsTemplateArgumentList()) {
1969 // We have something like t->getAs<T>(), where getAs is a
1970 // member of an unknown specialization. However, this will only
1971 // parse correctly as a template, so suggest the keyword 'template'
1972 // before 'getAs' and treat this as a dependent template name.
1974 if (Id.getKind() == UnqualifiedId::IK_Identifier)
1975 Name = Id.Identifier->getName();
1978 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId)
1979 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator);
1981 Name += Id.Identifier->getName();
1983 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword)
1985 << FixItHint::CreateInsertion(Id.StartLocation, "template ");
1986 TNK = Actions.ActOnDependentTemplateName(getCurScope(),
1987 SS, TemplateKWLoc, Id,
1988 ObjectType, EnteringContext,
1990 if (TNK == TNK_Non_template)
1996 case UnqualifiedId::IK_ConstructorName: {
1997 UnqualifiedId TemplateName;
1998 bool MemberOfUnknownSpecialization;
1999 TemplateName.setIdentifier(Name, NameLoc);
2000 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2001 TemplateName, ObjectType,
2002 EnteringContext, Template,
2003 MemberOfUnknownSpecialization);
2007 case UnqualifiedId::IK_DestructorName: {
2008 UnqualifiedId TemplateName;
2009 bool MemberOfUnknownSpecialization;
2010 TemplateName.setIdentifier(Name, NameLoc);
2012 TNK = Actions.ActOnDependentTemplateName(getCurScope(),
2013 SS, TemplateKWLoc, TemplateName,
2014 ObjectType, EnteringContext,
2016 if (TNK == TNK_Non_template)
2019 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2020 TemplateName, ObjectType,
2021 EnteringContext, Template,
2022 MemberOfUnknownSpecialization);
2024 if (TNK == TNK_Non_template && !Id.DestructorName.get()) {
2025 Diag(NameLoc, diag::err_destructor_template_id)
2026 << Name << SS.getRange();
2037 if (TNK == TNK_Non_template)
2040 // Parse the enclosed template argument list.
2041 SourceLocation LAngleLoc, RAngleLoc;
2042 TemplateArgList TemplateArgs;
2043 if (Tok.is(tok::less) &&
2044 ParseTemplateIdAfterTemplateName(Template, Id.StartLocation,
2045 SS, true, LAngleLoc,
2050 if (Id.getKind() == UnqualifiedId::IK_Identifier ||
2051 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2052 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) {
2053 // Form a parsed representation of the template-id to be stored in the
2055 TemplateIdAnnotation *TemplateId
2056 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds);
2058 // FIXME: Store name for literal operator too.
2059 if (Id.getKind() == UnqualifiedId::IK_Identifier) {
2060 TemplateId->Name = Id.Identifier;
2061 TemplateId->Operator = OO_None;
2062 TemplateId->TemplateNameLoc = Id.StartLocation;
2064 TemplateId->Name = nullptr;
2065 TemplateId->Operator = Id.OperatorFunctionId.Operator;
2066 TemplateId->TemplateNameLoc = Id.StartLocation;
2069 TemplateId->SS = SS;
2070 TemplateId->TemplateKWLoc = TemplateKWLoc;
2071 TemplateId->Template = Template;
2072 TemplateId->Kind = TNK;
2073 TemplateId->LAngleLoc = LAngleLoc;
2074 TemplateId->RAngleLoc = RAngleLoc;
2075 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
2076 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size();
2077 Arg != ArgEnd; ++Arg)
2078 Args[Arg] = TemplateArgs[Arg];
2080 Id.setTemplateId(TemplateId);
2084 // Bundle the template arguments together.
2085 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
2087 // Constructor and destructor names.
2089 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
2091 LAngleLoc, TemplateArgsPtr, RAngleLoc,
2092 /*IsCtorOrDtorName=*/true);
2093 if (Type.isInvalid())
2096 if (Id.getKind() == UnqualifiedId::IK_ConstructorName)
2097 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc);
2099 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc);
2104 /// \brief Parse an operator-function-id or conversion-function-id as part
2105 /// of a C++ unqualified-id.
2107 /// This routine is responsible only for parsing the operator-function-id or
2108 /// conversion-function-id; it does not handle template arguments in any way.
2111 /// operator-function-id: [C++ 13.5]
2112 /// 'operator' operator
2114 /// operator: one of
2115 /// new delete new[] delete[]
2116 /// + - * / % ^ & | ~
2117 /// ! = < > += -= *= /= %=
2118 /// ^= &= |= << >> >>= <<= == !=
2119 /// <= >= && || ++ -- , ->* ->
2122 /// conversion-function-id: [C++ 12.3.2]
2123 /// operator conversion-type-id
2125 /// conversion-type-id:
2126 /// type-specifier-seq conversion-declarator[opt]
2128 /// conversion-declarator:
2129 /// ptr-operator conversion-declarator[opt]
2132 /// \param SS The nested-name-specifier that preceded this unqualified-id. If
2133 /// non-empty, then we are parsing the unqualified-id of a qualified-id.
2135 /// \param EnteringContext whether we are entering the scope of the
2136 /// nested-name-specifier.
2138 /// \param ObjectType if this unqualified-id occurs within a member access
2139 /// expression, the type of the base object whose member is being accessed.
2141 /// \param Result on a successful parse, contains the parsed unqualified-id.
2143 /// \returns true if parsing fails, false otherwise.
2144 bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext,
2145 ParsedType ObjectType,
2146 UnqualifiedId &Result) {
2147 assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword");
2149 // Consume the 'operator' keyword.
2150 SourceLocation KeywordLoc = ConsumeToken();
2152 // Determine what kind of operator name we have.
2153 unsigned SymbolIdx = 0;
2154 SourceLocation SymbolLocations[3];
2155 OverloadedOperatorKind Op = OO_None;
2156 switch (Tok.getKind()) {
2158 case tok::kw_delete: {
2159 bool isNew = Tok.getKind() == tok::kw_new;
2160 // Consume the 'new' or 'delete'.
2161 SymbolLocations[SymbolIdx++] = ConsumeToken();
2162 // Check for array new/delete.
2163 if (Tok.is(tok::l_square) &&
2164 (!getLangOpts().CPlusPlus11 || NextToken().isNot(tok::l_square))) {
2165 // Consume the '[' and ']'.
2166 BalancedDelimiterTracker T(*this, tok::l_square);
2169 if (T.getCloseLocation().isInvalid())
2172 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2173 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2174 Op = isNew? OO_Array_New : OO_Array_Delete;
2176 Op = isNew? OO_New : OO_Delete;
2181 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
2183 SymbolLocations[SymbolIdx++] = ConsumeToken(); \
2186 #define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly)
2187 #include "clang/Basic/OperatorKinds.def"
2189 case tok::l_paren: {
2190 // Consume the '(' and ')'.
2191 BalancedDelimiterTracker T(*this, tok::l_paren);
2194 if (T.getCloseLocation().isInvalid())
2197 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2198 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2203 case tok::l_square: {
2204 // Consume the '[' and ']'.
2205 BalancedDelimiterTracker T(*this, tok::l_square);
2208 if (T.getCloseLocation().isInvalid())
2211 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2212 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2217 case tok::code_completion: {
2218 // Code completion for the operator name.
2219 Actions.CodeCompleteOperatorName(getCurScope());
2221 // Don't try to parse any further.
2229 if (Op != OO_None) {
2230 // We have parsed an operator-function-id.
2231 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations);
2235 // Parse a literal-operator-id.
2237 // literal-operator-id: C++11 [over.literal]
2238 // operator string-literal identifier
2239 // operator user-defined-string-literal
2241 if (getLangOpts().CPlusPlus11 && isTokenStringLiteral()) {
2242 Diag(Tok.getLocation(), diag::warn_cxx98_compat_literal_operator);
2244 SourceLocation DiagLoc;
2245 unsigned DiagId = 0;
2247 // We're past translation phase 6, so perform string literal concatenation
2248 // before checking for "".
2249 SmallVector<Token, 4> Toks;
2250 SmallVector<SourceLocation, 4> TokLocs;
2251 while (isTokenStringLiteral()) {
2252 if (!Tok.is(tok::string_literal) && !DiagId) {
2253 // C++11 [over.literal]p1:
2254 // The string-literal or user-defined-string-literal in a
2255 // literal-operator-id shall have no encoding-prefix [...].
2256 DiagLoc = Tok.getLocation();
2257 DiagId = diag::err_literal_operator_string_prefix;
2259 Toks.push_back(Tok);
2260 TokLocs.push_back(ConsumeStringToken());
2263 StringLiteralParser Literal(Toks, PP);
2264 if (Literal.hadError)
2267 // Grab the literal operator's suffix, which will be either the next token
2268 // or a ud-suffix from the string literal.
2269 IdentifierInfo *II = nullptr;
2270 SourceLocation SuffixLoc;
2271 if (!Literal.getUDSuffix().empty()) {
2272 II = &PP.getIdentifierTable().get(Literal.getUDSuffix());
2274 Lexer::AdvanceToTokenCharacter(TokLocs[Literal.getUDSuffixToken()],
2275 Literal.getUDSuffixOffset(),
2276 PP.getSourceManager(), getLangOpts());
2277 } else if (Tok.is(tok::identifier)) {
2278 II = Tok.getIdentifierInfo();
2279 SuffixLoc = ConsumeToken();
2280 TokLocs.push_back(SuffixLoc);
2282 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
2286 // The string literal must be empty.
2287 if (!Literal.GetString().empty() || Literal.Pascal) {
2288 // C++11 [over.literal]p1:
2289 // The string-literal or user-defined-string-literal in a
2290 // literal-operator-id shall [...] contain no characters
2291 // other than the implicit terminating '\0'.
2292 DiagLoc = TokLocs.front();
2293 DiagId = diag::err_literal_operator_string_not_empty;
2297 // This isn't a valid literal-operator-id, but we think we know
2298 // what the user meant. Tell them what they should have written.
2299 SmallString<32> Str;
2301 Str += II->getName();
2302 Diag(DiagLoc, DiagId) << FixItHint::CreateReplacement(
2303 SourceRange(TokLocs.front(), TokLocs.back()), Str);
2306 Result.setLiteralOperatorId(II, KeywordLoc, SuffixLoc);
2308 return Actions.checkLiteralOperatorId(SS, Result);
2311 // Parse a conversion-function-id.
2313 // conversion-function-id: [C++ 12.3.2]
2314 // operator conversion-type-id
2316 // conversion-type-id:
2317 // type-specifier-seq conversion-declarator[opt]
2319 // conversion-declarator:
2320 // ptr-operator conversion-declarator[opt]
2322 // Parse the type-specifier-seq.
2323 DeclSpec DS(AttrFactory);
2324 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType?
2327 // Parse the conversion-declarator, which is merely a sequence of
2329 Declarator D(DS, Declarator::ConversionIdContext);
2330 ParseDeclaratorInternal(D, /*DirectDeclParser=*/nullptr);
2332 // Finish up the type.
2333 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D);
2337 // Note that this is a conversion-function-id.
2338 Result.setConversionFunctionId(KeywordLoc, Ty.get(),
2339 D.getSourceRange().getEnd());
2343 /// \brief Parse a C++ unqualified-id (or a C identifier), which describes the
2344 /// name of an entity.
2347 /// unqualified-id: [C++ expr.prim.general]
2349 /// operator-function-id
2350 /// conversion-function-id
2351 /// [C++0x] literal-operator-id [TODO]
2357 /// \param SS The nested-name-specifier that preceded this unqualified-id. If
2358 /// non-empty, then we are parsing the unqualified-id of a qualified-id.
2360 /// \param EnteringContext whether we are entering the scope of the
2361 /// nested-name-specifier.
2363 /// \param AllowDestructorName whether we allow parsing of a destructor name.
2365 /// \param AllowConstructorName whether we allow parsing a constructor name.
2367 /// \param ObjectType if this unqualified-id occurs within a member access
2368 /// expression, the type of the base object whose member is being accessed.
2370 /// \param Result on a successful parse, contains the parsed unqualified-id.
2372 /// \returns true if parsing fails, false otherwise.
2373 bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext,
2374 bool AllowDestructorName,
2375 bool AllowConstructorName,
2376 ParsedType ObjectType,
2377 SourceLocation& TemplateKWLoc,
2378 UnqualifiedId &Result) {
2380 // Handle 'A::template B'. This is for template-ids which have not
2381 // already been annotated by ParseOptionalCXXScopeSpecifier().
2382 bool TemplateSpecified = false;
2383 if (getLangOpts().CPlusPlus && Tok.is(tok::kw_template) &&
2384 (ObjectType || SS.isSet())) {
2385 TemplateSpecified = true;
2386 TemplateKWLoc = ConsumeToken();
2391 // template-id (when it hasn't already been annotated)
2392 if (Tok.is(tok::identifier)) {
2393 // Consume the identifier.
2394 IdentifierInfo *Id = Tok.getIdentifierInfo();
2395 SourceLocation IdLoc = ConsumeToken();
2397 if (!getLangOpts().CPlusPlus) {
2398 // If we're not in C++, only identifiers matter. Record the
2399 // identifier and return.
2400 Result.setIdentifier(Id, IdLoc);
2404 if (AllowConstructorName &&
2405 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) {
2406 // We have parsed a constructor name.
2407 ParsedType Ty = Actions.getTypeName(*Id, IdLoc, getCurScope(),
2410 /*IsCtorOrDtorName=*/true,
2411 /*NonTrivialTypeSourceInfo=*/true);
2412 Result.setConstructorName(Ty, IdLoc, IdLoc);
2414 // We have parsed an identifier.
2415 Result.setIdentifier(Id, IdLoc);
2418 // If the next token is a '<', we may have a template.
2419 if (TemplateSpecified || Tok.is(tok::less))
2420 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, Id, IdLoc,
2421 EnteringContext, ObjectType,
2422 Result, TemplateSpecified);
2428 // template-id (already parsed and annotated)
2429 if (Tok.is(tok::annot_template_id)) {
2430 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2432 // If the template-name names the current class, then this is a constructor
2433 if (AllowConstructorName && TemplateId->Name &&
2434 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) {
2436 // C++ [class.qual]p2 specifies that a qualified template-name
2437 // is taken as the constructor name where a constructor can be
2438 // declared. Thus, the template arguments are extraneous, so
2439 // complain about them and remove them entirely.
2440 Diag(TemplateId->TemplateNameLoc,
2441 diag::err_out_of_line_constructor_template_id)
2443 << FixItHint::CreateRemoval(
2444 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc));
2445 ParsedType Ty = Actions.getTypeName(*TemplateId->Name,
2446 TemplateId->TemplateNameLoc,
2450 /*IsCtorOrDtorName=*/true,
2451 /*NontrivialTypeSourceInfo=*/true);
2452 Result.setConstructorName(Ty, TemplateId->TemplateNameLoc,
2453 TemplateId->RAngleLoc);
2458 Result.setConstructorTemplateId(TemplateId);
2463 // We have already parsed a template-id; consume the annotation token as
2464 // our unqualified-id.
2465 Result.setTemplateId(TemplateId);
2466 TemplateKWLoc = TemplateId->TemplateKWLoc;
2472 // operator-function-id
2473 // conversion-function-id
2474 if (Tok.is(tok::kw_operator)) {
2475 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result))
2478 // If we have an operator-function-id or a literal-operator-id and the next
2479 // token is a '<', we may have a
2482 // operator-function-id < template-argument-list[opt] >
2483 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2484 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) &&
2485 (TemplateSpecified || Tok.is(tok::less)))
2486 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2487 nullptr, SourceLocation(),
2488 EnteringContext, ObjectType,
2489 Result, TemplateSpecified);
2494 if (getLangOpts().CPlusPlus &&
2495 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) {
2496 // C++ [expr.unary.op]p10:
2497 // There is an ambiguity in the unary-expression ~X(), where X is a
2498 // class-name. The ambiguity is resolved in favor of treating ~ as a
2499 // unary complement rather than treating ~X as referring to a destructor.
2502 SourceLocation TildeLoc = ConsumeToken();
2504 if (SS.isEmpty() && Tok.is(tok::kw_decltype)) {
2505 DeclSpec DS(AttrFactory);
2506 SourceLocation EndLoc = ParseDecltypeSpecifier(DS);
2507 if (ParsedType Type = Actions.getDestructorType(DS, ObjectType)) {
2508 Result.setDestructorName(TildeLoc, Type, EndLoc);
2514 // Parse the class-name.
2515 if (Tok.isNot(tok::identifier)) {
2516 Diag(Tok, diag::err_destructor_tilde_identifier);
2520 // If the user wrote ~T::T, correct it to T::~T.
2521 DeclaratorScopeObj DeclScopeObj(*this, SS);
2522 if (!TemplateSpecified && NextToken().is(tok::coloncolon)) {
2523 // Don't let ParseOptionalCXXScopeSpecifier() "correct"
2524 // `int A; struct { ~A::A(); };` to `int A; struct { ~A:A(); };`,
2525 // it will confuse this recovery logic.
2526 ColonProtectionRAIIObject ColonRAII(*this, false);
2529 AnnotateScopeToken(SS, /*NewAnnotation*/true);
2532 if (ParseOptionalCXXScopeSpecifier(SS, ObjectType, EnteringContext))
2534 if (SS.isNotEmpty())
2535 ObjectType = ParsedType();
2536 if (Tok.isNot(tok::identifier) || NextToken().is(tok::coloncolon) ||
2538 Diag(TildeLoc, diag::err_destructor_tilde_scope);
2542 // Recover as if the tilde had been written before the identifier.
2543 Diag(TildeLoc, diag::err_destructor_tilde_scope)
2544 << FixItHint::CreateRemoval(TildeLoc)
2545 << FixItHint::CreateInsertion(Tok.getLocation(), "~");
2547 // Temporarily enter the scope for the rest of this function.
2548 if (Actions.ShouldEnterDeclaratorScope(getCurScope(), SS))
2549 DeclScopeObj.EnterDeclaratorScope();
2552 // Parse the class-name (or template-name in a simple-template-id).
2553 IdentifierInfo *ClassName = Tok.getIdentifierInfo();
2554 SourceLocation ClassNameLoc = ConsumeToken();
2556 if (TemplateSpecified || Tok.is(tok::less)) {
2557 Result.setDestructorName(TildeLoc, ParsedType(), ClassNameLoc);
2558 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2559 ClassName, ClassNameLoc,
2560 EnteringContext, ObjectType,
2561 Result, TemplateSpecified);
2564 // Note that this is a destructor name.
2565 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName,
2566 ClassNameLoc, getCurScope(),
2572 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc);
2576 Diag(Tok, diag::err_expected_unqualified_id)
2577 << getLangOpts().CPlusPlus;
2581 /// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate
2582 /// memory in a typesafe manner and call constructors.
2584 /// This method is called to parse the new expression after the optional :: has
2585 /// been already parsed. If the :: was present, "UseGlobal" is true and "Start"
2586 /// is its location. Otherwise, "Start" is the location of the 'new' token.
2589 /// '::'[opt] 'new' new-placement[opt] new-type-id
2590 /// new-initializer[opt]
2591 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2592 /// new-initializer[opt]
2595 /// '(' expression-list ')'
2598 /// type-specifier-seq new-declarator[opt]
2599 /// [GNU] attributes type-specifier-seq new-declarator[opt]
2602 /// ptr-operator new-declarator[opt]
2603 /// direct-new-declarator
2605 /// new-initializer:
2606 /// '(' expression-list[opt] ')'
2607 /// [C++0x] braced-init-list
2610 Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) {
2611 assert(Tok.is(tok::kw_new) && "expected 'new' token");
2612 ConsumeToken(); // Consume 'new'
2614 // A '(' now can be a new-placement or the '(' wrapping the type-id in the
2615 // second form of new-expression. It can't be a new-type-id.
2617 ExprVector PlacementArgs;
2618 SourceLocation PlacementLParen, PlacementRParen;
2620 SourceRange TypeIdParens;
2621 DeclSpec DS(AttrFactory);
2622 Declarator DeclaratorInfo(DS, Declarator::CXXNewContext);
2623 if (Tok.is(tok::l_paren)) {
2624 // If it turns out to be a placement, we change the type location.
2625 BalancedDelimiterTracker T(*this, tok::l_paren);
2627 PlacementLParen = T.getOpenLocation();
2628 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) {
2629 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2634 PlacementRParen = T.getCloseLocation();
2635 if (PlacementRParen.isInvalid()) {
2636 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2640 if (PlacementArgs.empty()) {
2641 // Reset the placement locations. There was no placement.
2642 TypeIdParens = T.getRange();
2643 PlacementLParen = PlacementRParen = SourceLocation();
2645 // We still need the type.
2646 if (Tok.is(tok::l_paren)) {
2647 BalancedDelimiterTracker T(*this, tok::l_paren);
2649 MaybeParseGNUAttributes(DeclaratorInfo);
2650 ParseSpecifierQualifierList(DS);
2651 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2652 ParseDeclarator(DeclaratorInfo);
2654 TypeIdParens = T.getRange();
2656 MaybeParseGNUAttributes(DeclaratorInfo);
2657 if (ParseCXXTypeSpecifierSeq(DS))
2658 DeclaratorInfo.setInvalidType(true);
2660 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2661 ParseDeclaratorInternal(DeclaratorInfo,
2662 &Parser::ParseDirectNewDeclarator);
2667 // A new-type-id is a simplified type-id, where essentially the
2668 // direct-declarator is replaced by a direct-new-declarator.
2669 MaybeParseGNUAttributes(DeclaratorInfo);
2670 if (ParseCXXTypeSpecifierSeq(DS))
2671 DeclaratorInfo.setInvalidType(true);
2673 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2674 ParseDeclaratorInternal(DeclaratorInfo,
2675 &Parser::ParseDirectNewDeclarator);
2678 if (DeclaratorInfo.isInvalidType()) {
2679 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2683 ExprResult Initializer;
2685 if (Tok.is(tok::l_paren)) {
2686 SourceLocation ConstructorLParen, ConstructorRParen;
2687 ExprVector ConstructorArgs;
2688 BalancedDelimiterTracker T(*this, tok::l_paren);
2690 ConstructorLParen = T.getOpenLocation();
2691 if (Tok.isNot(tok::r_paren)) {
2692 CommaLocsTy CommaLocs;
2693 if (ParseExpressionList(ConstructorArgs, CommaLocs, [&] {
2694 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(),
2695 DeclaratorInfo).get();
2696 Actions.CodeCompleteConstructor(getCurScope(),
2697 TypeRep.get()->getCanonicalTypeInternal(),
2698 DeclaratorInfo.getLocEnd(),
2701 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2706 ConstructorRParen = T.getCloseLocation();
2707 if (ConstructorRParen.isInvalid()) {
2708 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2711 Initializer = Actions.ActOnParenListExpr(ConstructorLParen,
2714 } else if (Tok.is(tok::l_brace) && getLangOpts().CPlusPlus11) {
2715 Diag(Tok.getLocation(),
2716 diag::warn_cxx98_compat_generalized_initializer_lists);
2717 Initializer = ParseBraceInitializer();
2719 if (Initializer.isInvalid())
2722 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen,
2723 PlacementArgs, PlacementRParen,
2724 TypeIdParens, DeclaratorInfo, Initializer.get());
2727 /// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be
2728 /// passed to ParseDeclaratorInternal.
2730 /// direct-new-declarator:
2731 /// '[' expression ']'
2732 /// direct-new-declarator '[' constant-expression ']'
2734 void Parser::ParseDirectNewDeclarator(Declarator &D) {
2735 // Parse the array dimensions.
2737 while (Tok.is(tok::l_square)) {
2738 // An array-size expression can't start with a lambda.
2739 if (CheckProhibitedCXX11Attribute())
2742 BalancedDelimiterTracker T(*this, tok::l_square);
2745 ExprResult Size(first ? ParseExpression()
2746 : ParseConstantExpression());
2747 if (Size.isInvalid()) {
2749 SkipUntil(tok::r_square, StopAtSemi);
2756 // Attributes here appertain to the array type. C++11 [expr.new]p5.
2757 ParsedAttributes Attrs(AttrFactory);
2758 MaybeParseCXX11Attributes(Attrs);
2760 D.AddTypeInfo(DeclaratorChunk::getArray(0,
2761 /*static=*/false, /*star=*/false,
2763 T.getOpenLocation(),
2764 T.getCloseLocation()),
2765 Attrs, T.getCloseLocation());
2767 if (T.getCloseLocation().isInvalid())
2772 /// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id.
2773 /// This ambiguity appears in the syntax of the C++ new operator.
2776 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2777 /// new-initializer[opt]
2780 /// '(' expression-list ')'
2782 bool Parser::ParseExpressionListOrTypeId(
2783 SmallVectorImpl<Expr*> &PlacementArgs,
2785 // The '(' was already consumed.
2786 if (isTypeIdInParens()) {
2787 ParseSpecifierQualifierList(D.getMutableDeclSpec());
2788 D.SetSourceRange(D.getDeclSpec().getSourceRange());
2790 return D.isInvalidType();
2793 // It's not a type, it has to be an expression list.
2794 // Discard the comma locations - ActOnCXXNew has enough parameters.
2795 CommaLocsTy CommaLocs;
2796 return ParseExpressionList(PlacementArgs, CommaLocs);
2799 /// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used
2800 /// to free memory allocated by new.
2802 /// This method is called to parse the 'delete' expression after the optional
2803 /// '::' has been already parsed. If the '::' was present, "UseGlobal" is true
2804 /// and "Start" is its location. Otherwise, "Start" is the location of the
2807 /// delete-expression:
2808 /// '::'[opt] 'delete' cast-expression
2809 /// '::'[opt] 'delete' '[' ']' cast-expression
2811 Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) {
2812 assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword");
2813 ConsumeToken(); // Consume 'delete'
2816 bool ArrayDelete = false;
2817 if (Tok.is(tok::l_square) && NextToken().is(tok::r_square)) {
2818 // C++11 [expr.delete]p1:
2819 // Whenever the delete keyword is followed by empty square brackets, it
2820 // shall be interpreted as [array delete].
2821 // [Footnote: A lambda expression with a lambda-introducer that consists
2822 // of empty square brackets can follow the delete keyword if
2823 // the lambda expression is enclosed in parentheses.]
2824 // FIXME: Produce a better diagnostic if the '[]' is unambiguously a
2825 // lambda-introducer.
2827 BalancedDelimiterTracker T(*this, tok::l_square);
2831 if (T.getCloseLocation().isInvalid())
2835 ExprResult Operand(ParseCastExpression(false));
2836 if (Operand.isInvalid())
2839 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.get());
2842 static TypeTrait TypeTraitFromTokKind(tok::TokenKind kind) {
2844 default: llvm_unreachable("Not a known type trait");
2845 #define TYPE_TRAIT_1(Spelling, Name, Key) \
2846 case tok::kw_ ## Spelling: return UTT_ ## Name;
2847 #define TYPE_TRAIT_2(Spelling, Name, Key) \
2848 case tok::kw_ ## Spelling: return BTT_ ## Name;
2849 #include "clang/Basic/TokenKinds.def"
2850 #define TYPE_TRAIT_N(Spelling, Name, Key) \
2851 case tok::kw_ ## Spelling: return TT_ ## Name;
2852 #include "clang/Basic/TokenKinds.def"
2856 static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) {
2858 default: llvm_unreachable("Not a known binary type trait");
2859 case tok::kw___array_rank: return ATT_ArrayRank;
2860 case tok::kw___array_extent: return ATT_ArrayExtent;
2864 static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) {
2866 default: llvm_unreachable("Not a known unary expression trait.");
2867 case tok::kw___is_lvalue_expr: return ET_IsLValueExpr;
2868 case tok::kw___is_rvalue_expr: return ET_IsRValueExpr;
2872 static unsigned TypeTraitArity(tok::TokenKind kind) {
2874 default: llvm_unreachable("Not a known type trait");
2875 #define TYPE_TRAIT(N,Spelling,K) case tok::kw_##Spelling: return N;
2876 #include "clang/Basic/TokenKinds.def"
2880 /// \brief Parse the built-in type-trait pseudo-functions that allow
2881 /// implementation of the TR1/C++11 type traits templates.
2883 /// primary-expression:
2884 /// unary-type-trait '(' type-id ')'
2885 /// binary-type-trait '(' type-id ',' type-id ')'
2886 /// type-trait '(' type-id-seq ')'
2889 /// type-id ...[opt] type-id-seq[opt]
2891 ExprResult Parser::ParseTypeTrait() {
2892 tok::TokenKind Kind = Tok.getKind();
2893 unsigned Arity = TypeTraitArity(Kind);
2895 SourceLocation Loc = ConsumeToken();
2897 BalancedDelimiterTracker Parens(*this, tok::l_paren);
2898 if (Parens.expectAndConsume())
2901 SmallVector<ParsedType, 2> Args;
2903 // Parse the next type.
2904 TypeResult Ty = ParseTypeName();
2905 if (Ty.isInvalid()) {
2910 // Parse the ellipsis, if present.
2911 if (Tok.is(tok::ellipsis)) {
2912 Ty = Actions.ActOnPackExpansion(Ty.get(), ConsumeToken());
2913 if (Ty.isInvalid()) {
2919 // Add this type to the list of arguments.
2920 Args.push_back(Ty.get());
2921 } while (TryConsumeToken(tok::comma));
2923 if (Parens.consumeClose())
2926 SourceLocation EndLoc = Parens.getCloseLocation();
2928 if (Arity && Args.size() != Arity) {
2929 Diag(EndLoc, diag::err_type_trait_arity)
2930 << Arity << 0 << (Arity > 1) << (int)Args.size() << SourceRange(Loc);
2934 if (!Arity && Args.empty()) {
2935 Diag(EndLoc, diag::err_type_trait_arity)
2936 << 1 << 1 << 1 << (int)Args.size() << SourceRange(Loc);
2940 return Actions.ActOnTypeTrait(TypeTraitFromTokKind(Kind), Loc, Args, EndLoc);
2943 /// ParseArrayTypeTrait - Parse the built-in array type-trait
2944 /// pseudo-functions.
2946 /// primary-expression:
2947 /// [Embarcadero] '__array_rank' '(' type-id ')'
2948 /// [Embarcadero] '__array_extent' '(' type-id ',' expression ')'
2950 ExprResult Parser::ParseArrayTypeTrait() {
2951 ArrayTypeTrait ATT = ArrayTypeTraitFromTokKind(Tok.getKind());
2952 SourceLocation Loc = ConsumeToken();
2954 BalancedDelimiterTracker T(*this, tok::l_paren);
2955 if (T.expectAndConsume())
2958 TypeResult Ty = ParseTypeName();
2959 if (Ty.isInvalid()) {
2960 SkipUntil(tok::comma, StopAtSemi);
2961 SkipUntil(tok::r_paren, StopAtSemi);
2966 case ATT_ArrayRank: {
2968 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), nullptr,
2969 T.getCloseLocation());
2971 case ATT_ArrayExtent: {
2972 if (ExpectAndConsume(tok::comma)) {
2973 SkipUntil(tok::r_paren, StopAtSemi);
2977 ExprResult DimExpr = ParseExpression();
2980 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), DimExpr.get(),
2981 T.getCloseLocation());
2984 llvm_unreachable("Invalid ArrayTypeTrait!");
2987 /// ParseExpressionTrait - Parse built-in expression-trait
2988 /// pseudo-functions like __is_lvalue_expr( xxx ).
2990 /// primary-expression:
2991 /// [Embarcadero] expression-trait '(' expression ')'
2993 ExprResult Parser::ParseExpressionTrait() {
2994 ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind());
2995 SourceLocation Loc = ConsumeToken();
2997 BalancedDelimiterTracker T(*this, tok::l_paren);
2998 if (T.expectAndConsume())
3001 ExprResult Expr = ParseExpression();
3005 return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(),
3006 T.getCloseLocation());
3010 /// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a
3011 /// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate
3012 /// based on the context past the parens.
3014 Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType,
3016 BalancedDelimiterTracker &Tracker,
3017 ColonProtectionRAIIObject &ColonProt) {
3018 assert(getLangOpts().CPlusPlus && "Should only be called for C++!");
3019 assert(ExprType == CastExpr && "Compound literals are not ambiguous!");
3020 assert(isTypeIdInParens() && "Not a type-id!");
3022 ExprResult Result(true);
3023 CastTy = ParsedType();
3025 // We need to disambiguate a very ugly part of the C++ syntax:
3027 // (T())x; - type-id
3028 // (T())*x; - type-id
3029 // (T())/x; - expression
3030 // (T()); - expression
3032 // The bad news is that we cannot use the specialized tentative parser, since
3033 // it can only verify that the thing inside the parens can be parsed as
3034 // type-id, it is not useful for determining the context past the parens.
3036 // The good news is that the parser can disambiguate this part without
3037 // making any unnecessary Action calls.
3039 // It uses a scheme similar to parsing inline methods. The parenthesized
3040 // tokens are cached, the context that follows is determined (possibly by
3041 // parsing a cast-expression), and then we re-introduce the cached tokens
3042 // into the token stream and parse them appropriately.
3044 ParenParseOption ParseAs;
3047 // Store the tokens of the parentheses. We will parse them after we determine
3048 // the context that follows them.
3049 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) {
3050 // We didn't find the ')' we expected.
3051 Tracker.consumeClose();
3055 if (Tok.is(tok::l_brace)) {
3056 ParseAs = CompoundLiteral;
3059 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) {
3062 // Try parsing the cast-expression that may follow.
3063 // If it is not a cast-expression, NotCastExpr will be true and no token
3064 // will be consumed.
3065 ColonProt.restore();
3066 Result = ParseCastExpression(false/*isUnaryExpression*/,
3067 false/*isAddressofOperand*/,
3069 // type-id has priority.
3073 // If we parsed a cast-expression, it's really a type-id, otherwise it's
3075 ParseAs = NotCastExpr ? SimpleExpr : CastExpr;
3078 // The current token should go after the cached tokens.
3079 Toks.push_back(Tok);
3080 // Re-enter the stored parenthesized tokens into the token stream, so we may
3082 PP.EnterTokenStream(Toks.data(), Toks.size(),
3083 true/*DisableMacroExpansion*/, false/*OwnsTokens*/);
3084 // Drop the current token and bring the first cached one. It's the same token
3085 // as when we entered this function.
3088 if (ParseAs >= CompoundLiteral) {
3089 // Parse the type declarator.
3090 DeclSpec DS(AttrFactory);
3091 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
3093 ColonProtectionRAIIObject InnerColonProtection(*this);
3094 ParseSpecifierQualifierList(DS);
3095 ParseDeclarator(DeclaratorInfo);
3099 Tracker.consumeClose();
3100 ColonProt.restore();
3102 if (ParseAs == CompoundLiteral) {
3103 ExprType = CompoundLiteral;
3104 if (DeclaratorInfo.isInvalidType())
3107 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
3108 return ParseCompoundLiteralExpression(Ty.get(),
3109 Tracker.getOpenLocation(),
3110 Tracker.getCloseLocation());
3113 // We parsed '(' type-id ')' and the thing after it wasn't a '{'.
3114 assert(ParseAs == CastExpr);
3116 if (DeclaratorInfo.isInvalidType())
3119 // Result is what ParseCastExpression returned earlier.
3120 if (!Result.isInvalid())
3121 Result = Actions.ActOnCastExpr(getCurScope(), Tracker.getOpenLocation(),
3122 DeclaratorInfo, CastTy,
3123 Tracker.getCloseLocation(), Result.get());
3127 // Not a compound literal, and not followed by a cast-expression.
3128 assert(ParseAs == SimpleExpr);
3130 ExprType = SimpleExpr;
3131 Result = ParseExpression();
3132 if (!Result.isInvalid() && Tok.is(tok::r_paren))
3133 Result = Actions.ActOnParenExpr(Tracker.getOpenLocation(),
3134 Tok.getLocation(), Result.get());
3137 if (Result.isInvalid()) {
3138 SkipUntil(tok::r_paren, StopAtSemi);
3142 Tracker.consumeClose();