| //===--- ParseTentative.cpp - Ambiguity Resolution Parsing ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the tentative parsing portions of the Parser |
| // interfaces, for ambiguity resolution. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Parse/Parser.h" |
| #include "clang/Parse/ParseDiagnostic.h" |
| #include "clang/Sema/ParsedTemplate.h" |
| using namespace clang; |
| |
| /// isCXXDeclarationStatement - C++-specialized function that disambiguates |
| /// between a declaration or an expression statement, when parsing function |
| /// bodies. Returns true for declaration, false for expression. |
| /// |
| /// declaration-statement: |
| /// block-declaration |
| /// |
| /// block-declaration: |
| /// simple-declaration |
| /// asm-definition |
| /// namespace-alias-definition |
| /// using-declaration |
| /// using-directive |
| /// [C++0x] static_assert-declaration |
| /// |
| /// asm-definition: |
| /// 'asm' '(' string-literal ')' ';' |
| /// |
| /// namespace-alias-definition: |
| /// 'namespace' identifier = qualified-namespace-specifier ';' |
| /// |
| /// using-declaration: |
| /// 'using' typename[opt] '::'[opt] nested-name-specifier |
| /// unqualified-id ';' |
| /// 'using' '::' unqualified-id ; |
| /// |
| /// using-directive: |
| /// 'using' 'namespace' '::'[opt] nested-name-specifier[opt] |
| /// namespace-name ';' |
| /// |
| bool Parser::isCXXDeclarationStatement() { |
| switch (Tok.getKind()) { |
| // asm-definition |
| case tok::kw_asm: |
| // namespace-alias-definition |
| case tok::kw_namespace: |
| // using-declaration |
| // using-directive |
| case tok::kw_using: |
| // static_assert-declaration |
| case tok::kw_static_assert: |
| case tok::kw__Static_assert: |
| return true; |
| // simple-declaration |
| default: |
| return isCXXSimpleDeclaration(/*AllowForRangeDecl=*/false); |
| } |
| } |
| |
| /// isCXXSimpleDeclaration - C++-specialized function that disambiguates |
| /// between a simple-declaration or an expression-statement. |
| /// If during the disambiguation process a parsing error is encountered, |
| /// the function returns true to let the declaration parsing code handle it. |
| /// Returns false if the statement is disambiguated as expression. |
| /// |
| /// simple-declaration: |
| /// decl-specifier-seq init-declarator-list[opt] ';' |
| /// |
| /// (if AllowForRangeDecl specified) |
| /// for ( for-range-declaration : for-range-initializer ) statement |
| /// for-range-declaration: |
| /// attribute-specifier-seqopt type-specifier-seq declarator |
| bool Parser::isCXXSimpleDeclaration(bool AllowForRangeDecl) { |
| // C++ 6.8p1: |
| // There is an ambiguity in the grammar involving expression-statements and |
| // declarations: An expression-statement with a function-style explicit type |
| // conversion (5.2.3) as its leftmost subexpression can be indistinguishable |
| // from a declaration where the first declarator starts with a '('. In those |
| // cases the statement is a declaration. [Note: To disambiguate, the whole |
| // statement might have to be examined to determine if it is an |
| // expression-statement or a declaration]. |
| |
| // C++ 6.8p3: |
| // The disambiguation is purely syntactic; that is, the meaning of the names |
| // occurring in such a statement, beyond whether they are type-names or not, |
| // is not generally used in or changed by the disambiguation. Class |
| // templates are instantiated as necessary to determine if a qualified name |
| // is a type-name. Disambiguation precedes parsing, and a statement |
| // disambiguated as a declaration may be an ill-formed declaration. |
| |
| // We don't have to parse all of the decl-specifier-seq part. There's only |
| // an ambiguity if the first decl-specifier is |
| // simple-type-specifier/typename-specifier followed by a '(', which may |
| // indicate a function-style cast expression. |
| // isCXXDeclarationSpecifier will return TPResult::Ambiguous() only in such |
| // a case. |
| |
| bool InvalidAsDeclaration = false; |
| TPResult TPR = isCXXDeclarationSpecifier(TPResult::False(), |
| &InvalidAsDeclaration); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR != TPResult::False(); // Returns true for TPResult::True() or |
| // TPResult::Error(). |
| |
| // FIXME: TryParseSimpleDeclaration doesn't look past the first initializer, |
| // and so gets some cases wrong. We can't carry on if we've already seen |
| // something which makes this statement invalid as a declaration in this case, |
| // since it can cause us to misparse valid code. Revisit this once |
| // TryParseInitDeclaratorList is fixed. |
| if (InvalidAsDeclaration) |
| return false; |
| |
| // FIXME: Add statistics about the number of ambiguous statements encountered |
| // and how they were resolved (number of declarations+number of expressions). |
| |
| // Ok, we have a simple-type-specifier/typename-specifier followed by a '(', |
| // or an identifier which doesn't resolve as anything. We need tentative |
| // parsing... |
| |
| TentativeParsingAction PA(*this); |
| TPR = TryParseSimpleDeclaration(AllowForRangeDecl); |
| PA.Revert(); |
| |
| // In case of an error, let the declaration parsing code handle it. |
| if (TPR == TPResult::Error()) |
| return true; |
| |
| // Declarations take precedence over expressions. |
| if (TPR == TPResult::Ambiguous()) |
| TPR = TPResult::True(); |
| |
| assert(TPR == TPResult::True() || TPR == TPResult::False()); |
| return TPR == TPResult::True(); |
| } |
| |
| /// simple-declaration: |
| /// decl-specifier-seq init-declarator-list[opt] ';' |
| /// |
| /// (if AllowForRangeDecl specified) |
| /// for ( for-range-declaration : for-range-initializer ) statement |
| /// for-range-declaration: |
| /// attribute-specifier-seqopt type-specifier-seq declarator |
| /// |
| Parser::TPResult Parser::TryParseSimpleDeclaration(bool AllowForRangeDecl) { |
| if (Tok.is(tok::kw_typeof)) |
| TryParseTypeofSpecifier(); |
| else { |
| if (Tok.is(tok::annot_cxxscope)) |
| ConsumeToken(); |
| ConsumeToken(); |
| |
| if (getLangOpts().ObjC1 && Tok.is(tok::less)) |
| TryParseProtocolQualifiers(); |
| } |
| |
| // Two decl-specifiers in a row conclusively disambiguate this as being a |
| // simple-declaration. Don't bother calling isCXXDeclarationSpecifier in the |
| // overwhelmingly common case that the next token is a '('. |
| if (Tok.isNot(tok::l_paren)) { |
| TPResult TPR = isCXXDeclarationSpecifier(); |
| if (TPR == TPResult::Ambiguous()) |
| return TPResult::True(); |
| if (TPR == TPResult::True() || TPR == TPResult::Error()) |
| return TPR; |
| assert(TPR == TPResult::False()); |
| } |
| |
| TPResult TPR = TryParseInitDeclaratorList(); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| |
| if (Tok.isNot(tok::semi) && (!AllowForRangeDecl || Tok.isNot(tok::colon))) |
| return TPResult::False(); |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| /// init-declarator-list: |
| /// init-declarator |
| /// init-declarator-list ',' init-declarator |
| /// |
| /// init-declarator: |
| /// declarator initializer[opt] |
| /// [GNU] declarator simple-asm-expr[opt] attributes[opt] initializer[opt] |
| /// |
| /// initializer: |
| /// '=' initializer-clause |
| /// '(' expression-list ')' |
| /// |
| /// initializer-clause: |
| /// assignment-expression |
| /// '{' initializer-list ','[opt] '}' |
| /// '{' '}' |
| /// |
| Parser::TPResult Parser::TryParseInitDeclaratorList() { |
| while (1) { |
| // declarator |
| TPResult TPR = TryParseDeclarator(false/*mayBeAbstract*/); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| |
| // [GNU] simple-asm-expr[opt] attributes[opt] |
| if (Tok.is(tok::kw_asm) || Tok.is(tok::kw___attribute)) |
| return TPResult::True(); |
| |
| // initializer[opt] |
| if (Tok.is(tok::l_paren)) { |
| // Parse through the parens. |
| ConsumeParen(); |
| if (!SkipUntil(tok::r_paren)) |
| return TPResult::Error(); |
| } else if (Tok.is(tok::equal) || isTokIdentifier_in()) { |
| // MSVC and g++ won't examine the rest of declarators if '=' is |
| // encountered; they just conclude that we have a declaration. |
| // EDG parses the initializer completely, which is the proper behavior |
| // for this case. |
| // |
| // At present, Clang follows MSVC and g++, since the parser does not have |
| // the ability to parse an expression fully without recording the |
| // results of that parse. |
| // Also allow 'in' after on objective-c declaration as in: |
| // for (int (^b)(void) in array). Ideally this should be done in the |
| // context of parsing for-init-statement of a foreach statement only. But, |
| // in any other context 'in' is invalid after a declaration and parser |
| // issues the error regardless of outcome of this decision. |
| // FIXME. Change if above assumption does not hold. |
| return TPResult::True(); |
| } |
| |
| if (Tok.isNot(tok::comma)) |
| break; |
| ConsumeToken(); // the comma. |
| } |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| /// isCXXConditionDeclaration - Disambiguates between a declaration or an |
| /// expression for a condition of a if/switch/while/for statement. |
| /// If during the disambiguation process a parsing error is encountered, |
| /// the function returns true to let the declaration parsing code handle it. |
| /// |
| /// condition: |
| /// expression |
| /// type-specifier-seq declarator '=' assignment-expression |
| /// [C++11] type-specifier-seq declarator '=' initializer-clause |
| /// [C++11] type-specifier-seq declarator braced-init-list |
| /// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt] |
| /// '=' assignment-expression |
| /// |
| bool Parser::isCXXConditionDeclaration() { |
| TPResult TPR = isCXXDeclarationSpecifier(); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR != TPResult::False(); // Returns true for TPResult::True() or |
| // TPResult::Error(). |
| |
| // FIXME: Add statistics about the number of ambiguous statements encountered |
| // and how they were resolved (number of declarations+number of expressions). |
| |
| // Ok, we have a simple-type-specifier/typename-specifier followed by a '('. |
| // We need tentative parsing... |
| |
| TentativeParsingAction PA(*this); |
| |
| // type-specifier-seq |
| if (Tok.is(tok::kw_typeof)) |
| TryParseTypeofSpecifier(); |
| else { |
| ConsumeToken(); |
| |
| if (getLangOpts().ObjC1 && Tok.is(tok::less)) |
| TryParseProtocolQualifiers(); |
| } |
| assert(Tok.is(tok::l_paren) && "Expected '('"); |
| |
| // declarator |
| TPR = TryParseDeclarator(false/*mayBeAbstract*/); |
| |
| // In case of an error, let the declaration parsing code handle it. |
| if (TPR == TPResult::Error()) |
| TPR = TPResult::True(); |
| |
| if (TPR == TPResult::Ambiguous()) { |
| // '=' |
| // [GNU] simple-asm-expr[opt] attributes[opt] |
| if (Tok.is(tok::equal) || |
| Tok.is(tok::kw_asm) || Tok.is(tok::kw___attribute)) |
| TPR = TPResult::True(); |
| else if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) |
| TPR = TPResult::True(); |
| else |
| TPR = TPResult::False(); |
| } |
| |
| PA.Revert(); |
| |
| assert(TPR == TPResult::True() || TPR == TPResult::False()); |
| return TPR == TPResult::True(); |
| } |
| |
| /// \brief Determine whether the next set of tokens contains a type-id. |
| /// |
| /// The context parameter states what context we're parsing right |
| /// now, which affects how this routine copes with the token |
| /// following the type-id. If the context is TypeIdInParens, we have |
| /// already parsed the '(' and we will cease lookahead when we hit |
| /// the corresponding ')'. If the context is |
| /// TypeIdAsTemplateArgument, we've already parsed the '<' or ',' |
| /// before this template argument, and will cease lookahead when we |
| /// hit a '>', '>>' (in C++0x), or ','. Returns true for a type-id |
| /// and false for an expression. If during the disambiguation |
| /// process a parsing error is encountered, the function returns |
| /// true to let the declaration parsing code handle it. |
| /// |
| /// type-id: |
| /// type-specifier-seq abstract-declarator[opt] |
| /// |
| bool Parser::isCXXTypeId(TentativeCXXTypeIdContext Context, bool &isAmbiguous) { |
| |
| isAmbiguous = false; |
| |
| // C++ 8.2p2: |
| // The ambiguity arising from the similarity between a function-style cast and |
| // a type-id can occur in different contexts. The ambiguity appears as a |
| // choice between a function-style cast expression and a declaration of a |
| // type. The resolution is that any construct that could possibly be a type-id |
| // in its syntactic context shall be considered a type-id. |
| |
| TPResult TPR = isCXXDeclarationSpecifier(); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR != TPResult::False(); // Returns true for TPResult::True() or |
| // TPResult::Error(). |
| |
| // FIXME: Add statistics about the number of ambiguous statements encountered |
| // and how they were resolved (number of declarations+number of expressions). |
| |
| // Ok, we have a simple-type-specifier/typename-specifier followed by a '('. |
| // We need tentative parsing... |
| |
| TentativeParsingAction PA(*this); |
| |
| // type-specifier-seq |
| if (Tok.is(tok::kw_typeof)) |
| TryParseTypeofSpecifier(); |
| else { |
| ConsumeToken(); |
| |
| if (getLangOpts().ObjC1 && Tok.is(tok::less)) |
| TryParseProtocolQualifiers(); |
| } |
| |
| assert(Tok.is(tok::l_paren) && "Expected '('"); |
| |
| // declarator |
| TPR = TryParseDeclarator(true/*mayBeAbstract*/, false/*mayHaveIdentifier*/); |
| |
| // In case of an error, let the declaration parsing code handle it. |
| if (TPR == TPResult::Error()) |
| TPR = TPResult::True(); |
| |
| if (TPR == TPResult::Ambiguous()) { |
| // We are supposed to be inside parens, so if after the abstract declarator |
| // we encounter a ')' this is a type-id, otherwise it's an expression. |
| if (Context == TypeIdInParens && Tok.is(tok::r_paren)) { |
| TPR = TPResult::True(); |
| isAmbiguous = true; |
| |
| // We are supposed to be inside a template argument, so if after |
| // the abstract declarator we encounter a '>', '>>' (in C++0x), or |
| // ',', this is a type-id. Otherwise, it's an expression. |
| } else if (Context == TypeIdAsTemplateArgument && |
| (Tok.is(tok::greater) || Tok.is(tok::comma) || |
| (getLangOpts().CPlusPlus11 && Tok.is(tok::greatergreater)))) { |
| TPR = TPResult::True(); |
| isAmbiguous = true; |
| |
| } else |
| TPR = TPResult::False(); |
| } |
| |
| PA.Revert(); |
| |
| assert(TPR == TPResult::True() || TPR == TPResult::False()); |
| return TPR == TPResult::True(); |
| } |
| |
| /// \brief Returns true if this is a C++11 attribute-specifier. Per |
| /// C++11 [dcl.attr.grammar]p6, two consecutive left square bracket tokens |
| /// always introduce an attribute. In Objective-C++11, this rule does not |
| /// apply if either '[' begins a message-send. |
| /// |
| /// If Disambiguate is true, we try harder to determine whether a '[[' starts |
| /// an attribute-specifier, and return CAK_InvalidAttributeSpecifier if not. |
| /// |
| /// If OuterMightBeMessageSend is true, we assume the outer '[' is either an |
| /// Obj-C message send or the start of an attribute. Otherwise, we assume it |
| /// is not an Obj-C message send. |
| /// |
| /// C++11 [dcl.attr.grammar]: |
| /// |
| /// attribute-specifier: |
| /// '[' '[' attribute-list ']' ']' |
| /// alignment-specifier |
| /// |
| /// attribute-list: |
| /// attribute[opt] |
| /// attribute-list ',' attribute[opt] |
| /// attribute '...' |
| /// attribute-list ',' attribute '...' |
| /// |
| /// attribute: |
| /// attribute-token attribute-argument-clause[opt] |
| /// |
| /// attribute-token: |
| /// identifier |
| /// identifier '::' identifier |
| /// |
| /// attribute-argument-clause: |
| /// '(' balanced-token-seq ')' |
| Parser::CXX11AttributeKind |
| Parser::isCXX11AttributeSpecifier(bool Disambiguate, |
| bool OuterMightBeMessageSend) { |
| if (Tok.is(tok::kw_alignas)) |
| return CAK_AttributeSpecifier; |
| |
| if (Tok.isNot(tok::l_square) || NextToken().isNot(tok::l_square)) |
| return CAK_NotAttributeSpecifier; |
| |
| // No tentative parsing if we don't need to look for ']]' or a lambda. |
| if (!Disambiguate && !getLangOpts().ObjC1) |
| return CAK_AttributeSpecifier; |
| |
| TentativeParsingAction PA(*this); |
| |
| // Opening brackets were checked for above. |
| ConsumeBracket(); |
| |
| // Outside Obj-C++11, treat anything with a matching ']]' as an attribute. |
| if (!getLangOpts().ObjC1) { |
| ConsumeBracket(); |
| |
| bool IsAttribute = SkipUntil(tok::r_square, false); |
| IsAttribute &= Tok.is(tok::r_square); |
| |
| PA.Revert(); |
| |
| return IsAttribute ? CAK_AttributeSpecifier : CAK_InvalidAttributeSpecifier; |
| } |
| |
| // In Obj-C++11, we need to distinguish four situations: |
| // 1a) int x[[attr]]; C++11 attribute. |
| // 1b) [[attr]]; C++11 statement attribute. |
| // 2) int x[[obj](){ return 1; }()]; Lambda in array size/index. |
| // 3a) int x[[obj get]]; Message send in array size/index. |
| // 3b) [[Class alloc] init]; Message send in message send. |
| // 4) [[obj]{ return self; }() doStuff]; Lambda in message send. |
| // (1) is an attribute, (2) is ill-formed, and (3) and (4) are accepted. |
| |
| // If we have a lambda-introducer, then this is definitely not a message send. |
| // FIXME: If this disambiguation is too slow, fold the tentative lambda parse |
| // into the tentative attribute parse below. |
| LambdaIntroducer Intro; |
| if (!TryParseLambdaIntroducer(Intro)) { |
| // A lambda cannot end with ']]', and an attribute must. |
| bool IsAttribute = Tok.is(tok::r_square); |
| |
| PA.Revert(); |
| |
| if (IsAttribute) |
| // Case 1: C++11 attribute. |
| return CAK_AttributeSpecifier; |
| |
| if (OuterMightBeMessageSend) |
| // Case 4: Lambda in message send. |
| return CAK_NotAttributeSpecifier; |
| |
| // Case 2: Lambda in array size / index. |
| return CAK_InvalidAttributeSpecifier; |
| } |
| |
| ConsumeBracket(); |
| |
| // If we don't have a lambda-introducer, then we have an attribute or a |
| // message-send. |
| bool IsAttribute = true; |
| while (Tok.isNot(tok::r_square)) { |
| if (Tok.is(tok::comma)) { |
| // Case 1: Stray commas can only occur in attributes. |
| PA.Revert(); |
| return CAK_AttributeSpecifier; |
| } |
| |
| // Parse the attribute-token, if present. |
| // C++11 [dcl.attr.grammar]: |
| // If a keyword or an alternative token that satisfies the syntactic |
| // requirements of an identifier is contained in an attribute-token, |
| // it is considered an identifier. |
| SourceLocation Loc; |
| if (!TryParseCXX11AttributeIdentifier(Loc)) { |
| IsAttribute = false; |
| break; |
| } |
| if (Tok.is(tok::coloncolon)) { |
| ConsumeToken(); |
| if (!TryParseCXX11AttributeIdentifier(Loc)) { |
| IsAttribute = false; |
| break; |
| } |
| } |
| |
| // Parse the attribute-argument-clause, if present. |
| if (Tok.is(tok::l_paren)) { |
| ConsumeParen(); |
| if (!SkipUntil(tok::r_paren, false)) { |
| IsAttribute = false; |
| break; |
| } |
| } |
| |
| if (Tok.is(tok::ellipsis)) |
| ConsumeToken(); |
| |
| if (Tok.isNot(tok::comma)) |
| break; |
| |
| ConsumeToken(); |
| } |
| |
| // An attribute must end ']]'. |
| if (IsAttribute) { |
| if (Tok.is(tok::r_square)) { |
| ConsumeBracket(); |
| IsAttribute = Tok.is(tok::r_square); |
| } else { |
| IsAttribute = false; |
| } |
| } |
| |
| PA.Revert(); |
| |
| if (IsAttribute) |
| // Case 1: C++11 statement attribute. |
| return CAK_AttributeSpecifier; |
| |
| // Case 3: Message send. |
| return CAK_NotAttributeSpecifier; |
| } |
| |
| /// declarator: |
| /// direct-declarator |
| /// ptr-operator declarator |
| /// |
| /// direct-declarator: |
| /// declarator-id |
| /// direct-declarator '(' parameter-declaration-clause ')' |
| /// cv-qualifier-seq[opt] exception-specification[opt] |
| /// direct-declarator '[' constant-expression[opt] ']' |
| /// '(' declarator ')' |
| /// [GNU] '(' attributes declarator ')' |
| /// |
| /// abstract-declarator: |
| /// ptr-operator abstract-declarator[opt] |
| /// direct-abstract-declarator |
| /// ... |
| /// |
| /// direct-abstract-declarator: |
| /// direct-abstract-declarator[opt] |
| /// '(' parameter-declaration-clause ')' cv-qualifier-seq[opt] |
| /// exception-specification[opt] |
| /// direct-abstract-declarator[opt] '[' constant-expression[opt] ']' |
| /// '(' abstract-declarator ')' |
| /// |
| /// ptr-operator: |
| /// '*' cv-qualifier-seq[opt] |
| /// '&' |
| /// [C++0x] '&&' [TODO] |
| /// '::'[opt] nested-name-specifier '*' cv-qualifier-seq[opt] |
| /// |
| /// cv-qualifier-seq: |
| /// cv-qualifier cv-qualifier-seq[opt] |
| /// |
| /// cv-qualifier: |
| /// 'const' |
| /// 'volatile' |
| /// |
| /// declarator-id: |
| /// '...'[opt] id-expression |
| /// |
| /// id-expression: |
| /// unqualified-id |
| /// qualified-id [TODO] |
| /// |
| /// unqualified-id: |
| /// identifier |
| /// operator-function-id [TODO] |
| /// conversion-function-id [TODO] |
| /// '~' class-name [TODO] |
| /// template-id [TODO] |
| /// |
| Parser::TPResult Parser::TryParseDeclarator(bool mayBeAbstract, |
| bool mayHaveIdentifier) { |
| // declarator: |
| // direct-declarator |
| // ptr-operator declarator |
| |
| while (1) { |
| if (Tok.is(tok::coloncolon) || Tok.is(tok::identifier)) |
| if (TryAnnotateCXXScopeToken(true)) |
| return TPResult::Error(); |
| |
| if (Tok.is(tok::star) || Tok.is(tok::amp) || Tok.is(tok::caret) || |
| Tok.is(tok::ampamp) || |
| (Tok.is(tok::annot_cxxscope) && NextToken().is(tok::star))) { |
| // ptr-operator |
| ConsumeToken(); |
| while (Tok.is(tok::kw_const) || |
| Tok.is(tok::kw_volatile) || |
| Tok.is(tok::kw_restrict)) |
| ConsumeToken(); |
| } else { |
| break; |
| } |
| } |
| |
| // direct-declarator: |
| // direct-abstract-declarator: |
| if (Tok.is(tok::ellipsis)) |
| ConsumeToken(); |
| |
| if ((Tok.is(tok::identifier) || |
| (Tok.is(tok::annot_cxxscope) && NextToken().is(tok::identifier))) && |
| mayHaveIdentifier) { |
| // declarator-id |
| if (Tok.is(tok::annot_cxxscope)) |
| ConsumeToken(); |
| else |
| TentativelyDeclaredIdentifiers.push_back(Tok.getIdentifierInfo()); |
| ConsumeToken(); |
| } else if (Tok.is(tok::l_paren)) { |
| ConsumeParen(); |
| if (mayBeAbstract && |
| (Tok.is(tok::r_paren) || // 'int()' is a function. |
| // 'int(...)' is a function. |
| (Tok.is(tok::ellipsis) && NextToken().is(tok::r_paren)) || |
| isDeclarationSpecifier())) { // 'int(int)' is a function. |
| // '(' parameter-declaration-clause ')' cv-qualifier-seq[opt] |
| // exception-specification[opt] |
| TPResult TPR = TryParseFunctionDeclarator(); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| } else { |
| // '(' declarator ')' |
| // '(' attributes declarator ')' |
| // '(' abstract-declarator ')' |
| if (Tok.is(tok::kw___attribute) || |
| Tok.is(tok::kw___declspec) || |
| Tok.is(tok::kw___cdecl) || |
| Tok.is(tok::kw___stdcall) || |
| Tok.is(tok::kw___fastcall) || |
| Tok.is(tok::kw___thiscall) || |
| Tok.is(tok::kw___unaligned)) |
| return TPResult::True(); // attributes indicate declaration |
| TPResult TPR = TryParseDeclarator(mayBeAbstract, mayHaveIdentifier); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| if (Tok.isNot(tok::r_paren)) |
| return TPResult::False(); |
| ConsumeParen(); |
| } |
| } else if (!mayBeAbstract) { |
| return TPResult::False(); |
| } |
| |
| while (1) { |
| TPResult TPR(TPResult::Ambiguous()); |
| |
| // abstract-declarator: ... |
| if (Tok.is(tok::ellipsis)) |
| ConsumeToken(); |
| |
| if (Tok.is(tok::l_paren)) { |
| // Check whether we have a function declarator or a possible ctor-style |
| // initializer that follows the declarator. Note that ctor-style |
| // initializers are not possible in contexts where abstract declarators |
| // are allowed. |
| if (!mayBeAbstract && !isCXXFunctionDeclarator()) |
| break; |
| |
| // direct-declarator '(' parameter-declaration-clause ')' |
| // cv-qualifier-seq[opt] exception-specification[opt] |
| ConsumeParen(); |
| TPR = TryParseFunctionDeclarator(); |
| } else if (Tok.is(tok::l_square)) { |
| // direct-declarator '[' constant-expression[opt] ']' |
| // direct-abstract-declarator[opt] '[' constant-expression[opt] ']' |
| TPR = TryParseBracketDeclarator(); |
| } else { |
| break; |
| } |
| |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| } |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| Parser::TPResult |
| Parser::isExpressionOrTypeSpecifierSimple(tok::TokenKind Kind) { |
| switch (Kind) { |
| // Obviously starts an expression. |
| case tok::numeric_constant: |
| case tok::char_constant: |
| case tok::wide_char_constant: |
| case tok::utf16_char_constant: |
| case tok::utf32_char_constant: |
| case tok::string_literal: |
| case tok::wide_string_literal: |
| case tok::utf8_string_literal: |
| case tok::utf16_string_literal: |
| case tok::utf32_string_literal: |
| case tok::l_square: |
| case tok::l_paren: |
| case tok::amp: |
| case tok::ampamp: |
| case tok::star: |
| case tok::plus: |
| case tok::plusplus: |
| case tok::minus: |
| case tok::minusminus: |
| case tok::tilde: |
| case tok::exclaim: |
| case tok::kw_sizeof: |
| case tok::kw___func__: |
| case tok::kw_const_cast: |
| case tok::kw_delete: |
| case tok::kw_dynamic_cast: |
| case tok::kw_false: |
| case tok::kw_new: |
| case tok::kw_operator: |
| case tok::kw_reinterpret_cast: |
| case tok::kw_static_cast: |
| case tok::kw_this: |
| case tok::kw_throw: |
| case tok::kw_true: |
| case tok::kw_typeid: |
| case tok::kw_alignof: |
| case tok::kw_noexcept: |
| case tok::kw_nullptr: |
| case tok::kw__Alignof: |
| case tok::kw___null: |
| case tok::kw___alignof: |
| case tok::kw___builtin_choose_expr: |
| case tok::kw___builtin_offsetof: |
| case tok::kw___builtin_types_compatible_p: |
| case tok::kw___builtin_va_arg: |
| case tok::kw___imag: |
| case tok::kw___real: |
| case tok::kw___FUNCTION__: |
| case tok::kw_L__FUNCTION__: |
| case tok::kw___PRETTY_FUNCTION__: |
| case tok::kw___has_nothrow_assign: |
| case tok::kw___has_nothrow_copy: |
| case tok::kw___has_nothrow_constructor: |
| case tok::kw___has_trivial_assign: |
| case tok::kw___has_trivial_copy: |
| case tok::kw___has_trivial_constructor: |
| case tok::kw___has_trivial_destructor: |
| case tok::kw___has_virtual_destructor: |
| case tok::kw___is_abstract: |
| case tok::kw___is_base_of: |
| case tok::kw___is_class: |
| case tok::kw___is_convertible_to: |
| case tok::kw___is_empty: |
| case tok::kw___is_enum: |
| case tok::kw___is_interface_class: |
| case tok::kw___is_final: |
| case tok::kw___is_literal: |
| case tok::kw___is_literal_type: |
| case tok::kw___is_pod: |
| case tok::kw___is_polymorphic: |
| case tok::kw___is_trivial: |
| case tok::kw___is_trivially_assignable: |
| case tok::kw___is_trivially_constructible: |
| case tok::kw___is_trivially_copyable: |
| case tok::kw___is_union: |
| case tok::kw___uuidof: |
| return TPResult::True(); |
| |
| // Obviously starts a type-specifier-seq: |
| case tok::kw_char: |
| case tok::kw_const: |
| case tok::kw_double: |
| case tok::kw_enum: |
| case tok::kw_half: |
| case tok::kw_float: |
| case tok::kw_int: |
| case tok::kw_long: |
| case tok::kw___int64: |
| case tok::kw___int128: |
| case tok::kw_restrict: |
| case tok::kw_short: |
| case tok::kw_signed: |
| case tok::kw_struct: |
| case tok::kw_union: |
| case tok::kw_unsigned: |
| case tok::kw_void: |
| case tok::kw_volatile: |
| case tok::kw__Bool: |
| case tok::kw__Complex: |
| case tok::kw_class: |
| case tok::kw_typename: |
| case tok::kw_wchar_t: |
| case tok::kw_char16_t: |
| case tok::kw_char32_t: |
| case tok::kw___underlying_type: |
| case tok::kw_thread_local: |
| case tok::kw__Decimal32: |
| case tok::kw__Decimal64: |
| case tok::kw__Decimal128: |
| case tok::kw___thread: |
| case tok::kw_typeof: |
| case tok::kw___cdecl: |
| case tok::kw___stdcall: |
| case tok::kw___fastcall: |
| case tok::kw___thiscall: |
| case tok::kw___unaligned: |
| case tok::kw___vector: |
| case tok::kw___pixel: |
| case tok::kw__Atomic: |
| case tok::kw_image1d_t: |
| case tok::kw_image1d_array_t: |
| case tok::kw_image1d_buffer_t: |
| case tok::kw_image2d_t: |
| case tok::kw_image2d_array_t: |
| case tok::kw_image3d_t: |
| case tok::kw_sampler_t: |
| case tok::kw_event_t: |
| case tok::kw___unknown_anytype: |
| return TPResult::False(); |
| |
| default: |
| break; |
| } |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| bool Parser::isTentativelyDeclared(IdentifierInfo *II) { |
| return std::find(TentativelyDeclaredIdentifiers.begin(), |
| TentativelyDeclaredIdentifiers.end(), II) |
| != TentativelyDeclaredIdentifiers.end(); |
| } |
| |
| /// isCXXDeclarationSpecifier - Returns TPResult::True() if it is a declaration |
| /// specifier, TPResult::False() if it is not, TPResult::Ambiguous() if it could |
| /// be either a decl-specifier or a function-style cast, and TPResult::Error() |
| /// if a parsing error was found and reported. |
| /// |
| /// If HasMissingTypename is provided, a name with a dependent scope specifier |
| /// will be treated as ambiguous if the 'typename' keyword is missing. If this |
| /// happens, *HasMissingTypename will be set to 'true'. This will also be used |
| /// as an indicator that undeclared identifiers (which will trigger a later |
| /// parse error) should be treated as types. Returns TPResult::Ambiguous() in |
| /// such cases. |
| /// |
| /// decl-specifier: |
| /// storage-class-specifier |
| /// type-specifier |
| /// function-specifier |
| /// 'friend' |
| /// 'typedef' |
| /// [C++0x] 'constexpr' |
| /// [GNU] attributes declaration-specifiers[opt] |
| /// |
| /// storage-class-specifier: |
| /// 'register' |
| /// 'static' |
| /// 'extern' |
| /// 'mutable' |
| /// 'auto' |
| /// [GNU] '__thread' |
| /// |
| /// function-specifier: |
| /// 'inline' |
| /// 'virtual' |
| /// 'explicit' |
| /// |
| /// typedef-name: |
| /// identifier |
| /// |
| /// type-specifier: |
| /// simple-type-specifier |
| /// class-specifier |
| /// enum-specifier |
| /// elaborated-type-specifier |
| /// typename-specifier |
| /// cv-qualifier |
| /// |
| /// simple-type-specifier: |
| /// '::'[opt] nested-name-specifier[opt] type-name |
| /// '::'[opt] nested-name-specifier 'template' |
| /// simple-template-id [TODO] |
| /// 'char' |
| /// 'wchar_t' |
| /// 'bool' |
| /// 'short' |
| /// 'int' |
| /// 'long' |
| /// 'signed' |
| /// 'unsigned' |
| /// 'float' |
| /// 'double' |
| /// 'void' |
| /// [GNU] typeof-specifier |
| /// [GNU] '_Complex' |
| /// [C++0x] 'auto' [TODO] |
| /// [C++0x] 'decltype' ( expression ) |
| /// |
| /// type-name: |
| /// class-name |
| /// enum-name |
| /// typedef-name |
| /// |
| /// elaborated-type-specifier: |
| /// class-key '::'[opt] nested-name-specifier[opt] identifier |
| /// class-key '::'[opt] nested-name-specifier[opt] 'template'[opt] |
| /// simple-template-id |
| /// 'enum' '::'[opt] nested-name-specifier[opt] identifier |
| /// |
| /// enum-name: |
| /// identifier |
| /// |
| /// enum-specifier: |
| /// 'enum' identifier[opt] '{' enumerator-list[opt] '}' |
| /// 'enum' identifier[opt] '{' enumerator-list ',' '}' |
| /// |
| /// class-specifier: |
| /// class-head '{' member-specification[opt] '}' |
| /// |
| /// class-head: |
| /// class-key identifier[opt] base-clause[opt] |
| /// class-key nested-name-specifier identifier base-clause[opt] |
| /// class-key nested-name-specifier[opt] simple-template-id |
| /// base-clause[opt] |
| /// |
| /// class-key: |
| /// 'class' |
| /// 'struct' |
| /// 'union' |
| /// |
| /// cv-qualifier: |
| /// 'const' |
| /// 'volatile' |
| /// [GNU] restrict |
| /// |
| Parser::TPResult |
| Parser::isCXXDeclarationSpecifier(Parser::TPResult BracedCastResult, |
| bool *HasMissingTypename) { |
| switch (Tok.getKind()) { |
| case tok::identifier: { |
| // Check for need to substitute AltiVec __vector keyword |
| // for "vector" identifier. |
| if (TryAltiVecVectorToken()) |
| return TPResult::True(); |
| |
| const Token &Next = NextToken(); |
| // In 'foo bar', 'foo' is always a type name outside of Objective-C. |
| if (!getLangOpts().ObjC1 && Next.is(tok::identifier)) |
| return TPResult::True(); |
| |
| if (Next.isNot(tok::coloncolon) && Next.isNot(tok::less)) { |
| // Determine whether this is a valid expression. If not, we will hit |
| // a parse error one way or another. In that case, tell the caller that |
| // this is ambiguous. Typo-correct to type and expression keywords and |
| // to types and identifiers, in order to try to recover from errors. |
| CorrectionCandidateCallback TypoCorrection; |
| TypoCorrection.WantRemainingKeywords = false; |
| switch (TryAnnotateName(false /* no nested name specifier */, |
| &TypoCorrection)) { |
| case ANK_Error: |
| return TPResult::Error(); |
| case ANK_TentativeDecl: |
| return TPResult::False(); |
| case ANK_TemplateName: |
| // A bare type template-name which can't be a template template |
| // argument is an error, and was probably intended to be a type. |
| return GreaterThanIsOperator ? TPResult::True() : TPResult::False(); |
| case ANK_Unresolved: |
| return HasMissingTypename ? TPResult::Ambiguous() : TPResult::False(); |
| case ANK_Success: |
| break; |
| } |
| assert(Tok.isNot(tok::identifier) && |
| "TryAnnotateName succeeded without producing an annotation"); |
| } else { |
| // This might possibly be a type with a dependent scope specifier and |
| // a missing 'typename' keyword. Don't use TryAnnotateName in this case, |
| // since it will annotate as a primary expression, and we want to use the |
| // "missing 'typename'" logic. |
| if (TryAnnotateTypeOrScopeToken()) |
| return TPResult::Error(); |
| // If annotation failed, assume it's a non-type. |
| // FIXME: If this happens due to an undeclared identifier, treat it as |
| // ambiguous. |
| if (Tok.is(tok::identifier)) |
| return TPResult::False(); |
| } |
| |
| // We annotated this token as something. Recurse to handle whatever we got. |
| return isCXXDeclarationSpecifier(BracedCastResult, HasMissingTypename); |
| } |
| |
| case tok::kw_typename: // typename T::type |
| // Annotate typenames and C++ scope specifiers. If we get one, just |
| // recurse to handle whatever we get. |
| if (TryAnnotateTypeOrScopeToken()) |
| return TPResult::Error(); |
| return isCXXDeclarationSpecifier(BracedCastResult, HasMissingTypename); |
| |
| case tok::coloncolon: { // ::foo::bar |
| const Token &Next = NextToken(); |
| if (Next.is(tok::kw_new) || // ::new |
| Next.is(tok::kw_delete)) // ::delete |
| return TPResult::False(); |
| } |
| // Fall through. |
| case tok::kw_decltype: |
| // Annotate typenames and C++ scope specifiers. If we get one, just |
| // recurse to handle whatever we get. |
| if (TryAnnotateTypeOrScopeToken()) |
| return TPResult::Error(); |
| return isCXXDeclarationSpecifier(BracedCastResult, HasMissingTypename); |
| |
| // decl-specifier: |
| // storage-class-specifier |
| // type-specifier |
| // function-specifier |
| // 'friend' |
| // 'typedef' |
| // 'constexpr' |
| case tok::kw_friend: |
| case tok::kw_typedef: |
| case tok::kw_constexpr: |
| // storage-class-specifier |
| case tok::kw_register: |
| case tok::kw_static: |
| case tok::kw_extern: |
| case tok::kw_mutable: |
| case tok::kw_auto: |
| case tok::kw___thread: |
| // function-specifier |
| case tok::kw_inline: |
| case tok::kw_virtual: |
| case tok::kw_explicit: |
| |
| // Modules |
| case tok::kw___module_private__: |
| |
| // Debugger support |
| case tok::kw___unknown_anytype: |
| |
| // type-specifier: |
| // simple-type-specifier |
| // class-specifier |
| // enum-specifier |
| // elaborated-type-specifier |
| // typename-specifier |
| // cv-qualifier |
| |
| // class-specifier |
| // elaborated-type-specifier |
| case tok::kw_class: |
| case tok::kw_struct: |
| case tok::kw_union: |
| // enum-specifier |
| case tok::kw_enum: |
| // cv-qualifier |
| case tok::kw_const: |
| case tok::kw_volatile: |
| |
| // GNU |
| case tok::kw_restrict: |
| case tok::kw__Complex: |
| case tok::kw___attribute: |
| return TPResult::True(); |
| |
| // Microsoft |
| case tok::kw___declspec: |
| case tok::kw___cdecl: |
| case tok::kw___stdcall: |
| case tok::kw___fastcall: |
| case tok::kw___thiscall: |
| case tok::kw___w64: |
| case tok::kw___ptr64: |
| case tok::kw___ptr32: |
| case tok::kw___forceinline: |
| case tok::kw___unaligned: |
| return TPResult::True(); |
| |
| // Borland |
| case tok::kw___pascal: |
| return TPResult::True(); |
| |
| // AltiVec |
| case tok::kw___vector: |
| return TPResult::True(); |
| |
| case tok::annot_template_id: { |
| TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); |
| if (TemplateId->Kind != TNK_Type_template) |
| return TPResult::False(); |
| CXXScopeSpec SS; |
| AnnotateTemplateIdTokenAsType(); |
| assert(Tok.is(tok::annot_typename)); |
| goto case_typename; |
| } |
| |
| case tok::annot_cxxscope: // foo::bar or ::foo::bar, but already parsed |
| // We've already annotated a scope; try to annotate a type. |
| if (TryAnnotateTypeOrScopeToken()) |
| return TPResult::Error(); |
| if (!Tok.is(tok::annot_typename)) { |
| // If the next token is an identifier or a type qualifier, then this |
| // can't possibly be a valid expression either. |
| if (Tok.is(tok::annot_cxxscope) && NextToken().is(tok::identifier)) { |
| CXXScopeSpec SS; |
| Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(), |
| Tok.getAnnotationRange(), |
| SS); |
| if (SS.getScopeRep() && SS.getScopeRep()->isDependent()) { |
| TentativeParsingAction PA(*this); |
| ConsumeToken(); |
| ConsumeToken(); |
| bool isIdentifier = Tok.is(tok::identifier); |
| TPResult TPR = TPResult::False(); |
| if (!isIdentifier) |
| TPR = isCXXDeclarationSpecifier(BracedCastResult, |
| HasMissingTypename); |
| PA.Revert(); |
| |
| if (isIdentifier || |
| TPR == TPResult::True() || TPR == TPResult::Error()) |
| return TPResult::Error(); |
| |
| if (HasMissingTypename) { |
| // We can't tell whether this is a missing 'typename' or a valid |
| // expression. |
| *HasMissingTypename = true; |
| return TPResult::Ambiguous(); |
| } |
| } else { |
| // Try to resolve the name. If it doesn't exist, assume it was |
| // intended to name a type and keep disambiguating. |
| switch (TryAnnotateName(false /* SS is not dependent */)) { |
| case ANK_Error: |
| return TPResult::Error(); |
| case ANK_TentativeDecl: |
| return TPResult::False(); |
| case ANK_TemplateName: |
| // A bare type template-name which can't be a template template |
| // argument is an error, and was probably intended to be a type. |
| return GreaterThanIsOperator ? TPResult::True() : TPResult::False(); |
| case ANK_Unresolved: |
| return HasMissingTypename ? TPResult::Ambiguous() |
| : TPResult::False(); |
| case ANK_Success: |
| // Annotated it, check again. |
| assert(Tok.isNot(tok::annot_cxxscope) || |
| NextToken().isNot(tok::identifier)); |
| return isCXXDeclarationSpecifier(BracedCastResult, |
| HasMissingTypename); |
| } |
| } |
| } |
| return TPResult::False(); |
| } |
| // If that succeeded, fallthrough into the generic simple-type-id case. |
| |
| // The ambiguity resides in a simple-type-specifier/typename-specifier |
| // followed by a '('. The '(' could either be the start of: |
| // |
| // direct-declarator: |
| // '(' declarator ')' |
| // |
| // direct-abstract-declarator: |
| // '(' parameter-declaration-clause ')' cv-qualifier-seq[opt] |
| // exception-specification[opt] |
| // '(' abstract-declarator ')' |
| // |
| // or part of a function-style cast expression: |
| // |
| // simple-type-specifier '(' expression-list[opt] ')' |
| // |
| |
| // simple-type-specifier: |
| |
| case tok::annot_typename: |
| case_typename: |
| // In Objective-C, we might have a protocol-qualified type. |
| if (getLangOpts().ObjC1 && NextToken().is(tok::less)) { |
| // Tentatively parse the |
| TentativeParsingAction PA(*this); |
| ConsumeToken(); // The type token |
| |
| TPResult TPR = TryParseProtocolQualifiers(); |
| bool isFollowedByParen = Tok.is(tok::l_paren); |
| bool isFollowedByBrace = Tok.is(tok::l_brace); |
| |
| PA.Revert(); |
| |
| if (TPR == TPResult::Error()) |
| return TPResult::Error(); |
| |
| if (isFollowedByParen) |
| return TPResult::Ambiguous(); |
| |
| if (getLangOpts().CPlusPlus11 && isFollowedByBrace) |
| return BracedCastResult; |
| |
| return TPResult::True(); |
| } |
| |
| case tok::kw_char: |
| case tok::kw_wchar_t: |
| case tok::kw_char16_t: |
| case tok::kw_char32_t: |
| case tok::kw_bool: |
| case tok::kw_short: |
| case tok::kw_int: |
| case tok::kw_long: |
| case tok::kw___int64: |
| case tok::kw___int128: |
| case tok::kw_signed: |
| case tok::kw_unsigned: |
| case tok::kw_half: |
| case tok::kw_float: |
| case tok::kw_double: |
| case tok::kw_void: |
| case tok::annot_decltype: |
| if (NextToken().is(tok::l_paren)) |
| return TPResult::Ambiguous(); |
| |
| // This is a function-style cast in all cases we disambiguate other than |
| // one: |
| // struct S { |
| // enum E : int { a = 4 }; // enum |
| // enum E : int { 4 }; // bit-field |
| // }; |
| if (getLangOpts().CPlusPlus11 && NextToken().is(tok::l_brace)) |
| return BracedCastResult; |
| |
| if (isStartOfObjCClassMessageMissingOpenBracket()) |
| return TPResult::False(); |
| |
| return TPResult::True(); |
| |
| // GNU typeof support. |
| case tok::kw_typeof: { |
| if (NextToken().isNot(tok::l_paren)) |
| return TPResult::True(); |
| |
| TentativeParsingAction PA(*this); |
| |
| TPResult TPR = TryParseTypeofSpecifier(); |
| bool isFollowedByParen = Tok.is(tok::l_paren); |
| bool isFollowedByBrace = Tok.is(tok::l_brace); |
| |
| PA.Revert(); |
| |
| if (TPR == TPResult::Error()) |
| return TPResult::Error(); |
| |
| if (isFollowedByParen) |
| return TPResult::Ambiguous(); |
| |
| if (getLangOpts().CPlusPlus11 && isFollowedByBrace) |
| return BracedCastResult; |
| |
| return TPResult::True(); |
| } |
| |
| // C++0x type traits support |
| case tok::kw___underlying_type: |
| return TPResult::True(); |
| |
| // C11 _Atomic |
| case tok::kw__Atomic: |
| return TPResult::True(); |
| |
| default: |
| return TPResult::False(); |
| } |
| } |
| |
| /// [GNU] typeof-specifier: |
| /// 'typeof' '(' expressions ')' |
| /// 'typeof' '(' type-name ')' |
| /// |
| Parser::TPResult Parser::TryParseTypeofSpecifier() { |
| assert(Tok.is(tok::kw_typeof) && "Expected 'typeof'!"); |
| ConsumeToken(); |
| |
| assert(Tok.is(tok::l_paren) && "Expected '('"); |
| // Parse through the parens after 'typeof'. |
| ConsumeParen(); |
| if (!SkipUntil(tok::r_paren)) |
| return TPResult::Error(); |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| /// [ObjC] protocol-qualifiers: |
| //// '<' identifier-list '>' |
| Parser::TPResult Parser::TryParseProtocolQualifiers() { |
| assert(Tok.is(tok::less) && "Expected '<' for qualifier list"); |
| ConsumeToken(); |
| do { |
| if (Tok.isNot(tok::identifier)) |
| return TPResult::Error(); |
| ConsumeToken(); |
| |
| if (Tok.is(tok::comma)) { |
| ConsumeToken(); |
| continue; |
| } |
| |
| if (Tok.is(tok::greater)) { |
| ConsumeToken(); |
| return TPResult::Ambiguous(); |
| } |
| } while (false); |
| |
| return TPResult::Error(); |
| } |
| |
| Parser::TPResult |
| Parser::TryParseDeclarationSpecifier(bool *HasMissingTypename) { |
| TPResult TPR = isCXXDeclarationSpecifier(TPResult::False(), |
| HasMissingTypename); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| |
| if (Tok.is(tok::kw_typeof)) |
| TryParseTypeofSpecifier(); |
| else { |
| if (Tok.is(tok::annot_cxxscope)) |
| ConsumeToken(); |
| ConsumeToken(); |
| |
| if (getLangOpts().ObjC1 && Tok.is(tok::less)) |
| TryParseProtocolQualifiers(); |
| } |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| /// isCXXFunctionDeclarator - Disambiguates between a function declarator or |
| /// a constructor-style initializer, when parsing declaration statements. |
| /// Returns true for function declarator and false for constructor-style |
| /// initializer. |
| /// If during the disambiguation process a parsing error is encountered, |
| /// the function returns true to let the declaration parsing code handle it. |
| /// |
| /// '(' parameter-declaration-clause ')' cv-qualifier-seq[opt] |
| /// exception-specification[opt] |
| /// |
| bool Parser::isCXXFunctionDeclarator(bool *IsAmbiguous) { |
| |
| // C++ 8.2p1: |
| // The ambiguity arising from the similarity between a function-style cast and |
| // a declaration mentioned in 6.8 can also occur in the context of a |
| // declaration. In that context, the choice is between a function declaration |
| // with a redundant set of parentheses around a parameter name and an object |
| // declaration with a function-style cast as the initializer. Just as for the |
| // ambiguities mentioned in 6.8, the resolution is to consider any construct |
| // that could possibly be a declaration a declaration. |
| |
| TentativeParsingAction PA(*this); |
| |
| ConsumeParen(); |
| bool InvalidAsDeclaration = false; |
| TPResult TPR = TryParseParameterDeclarationClause(&InvalidAsDeclaration); |
| if (TPR == TPResult::Ambiguous()) { |
| if (Tok.isNot(tok::r_paren)) |
| TPR = TPResult::False(); |
| else { |
| const Token &Next = NextToken(); |
| if (Next.is(tok::amp) || Next.is(tok::ampamp) || |
| Next.is(tok::kw_const) || Next.is(tok::kw_volatile) || |
| Next.is(tok::kw_throw) || Next.is(tok::kw_noexcept) || |
| Next.is(tok::l_square) || isCXX11VirtSpecifier(Next) || |
| Next.is(tok::l_brace) || Next.is(tok::kw_try) || |
| Next.is(tok::equal) || Next.is(tok::arrow)) |
| // The next token cannot appear after a constructor-style initializer, |
| // and can appear next in a function definition. This must be a function |
| // declarator. |
| TPR = TPResult::True(); |
| else if (InvalidAsDeclaration) |
| // Use the absence of 'typename' as a tie-breaker. |
| TPR = TPResult::False(); |
| } |
| } |
| |
| PA.Revert(); |
| |
| if (IsAmbiguous && TPR == TPResult::Ambiguous()) |
| *IsAmbiguous = true; |
| |
| // In case of an error, let the declaration parsing code handle it. |
| return TPR != TPResult::False(); |
| } |
| |
| /// parameter-declaration-clause: |
| /// parameter-declaration-list[opt] '...'[opt] |
| /// parameter-declaration-list ',' '...' |
| /// |
| /// parameter-declaration-list: |
| /// parameter-declaration |
| /// parameter-declaration-list ',' parameter-declaration |
| /// |
| /// parameter-declaration: |
| /// attribute-specifier-seq[opt] decl-specifier-seq declarator attributes[opt] |
| /// attribute-specifier-seq[opt] decl-specifier-seq declarator attributes[opt] |
| /// '=' assignment-expression |
| /// attribute-specifier-seq[opt] decl-specifier-seq abstract-declarator[opt] |
| /// attributes[opt] |
| /// attribute-specifier-seq[opt] decl-specifier-seq abstract-declarator[opt] |
| /// attributes[opt] '=' assignment-expression |
| /// |
| Parser::TPResult |
| Parser::TryParseParameterDeclarationClause(bool *InvalidAsDeclaration) { |
| |
| if (Tok.is(tok::r_paren)) |
| return TPResult::Ambiguous(); |
| |
| // parameter-declaration-list[opt] '...'[opt] |
| // parameter-declaration-list ',' '...' |
| // |
| // parameter-declaration-list: |
| // parameter-declaration |
| // parameter-declaration-list ',' parameter-declaration |
| // |
| while (1) { |
| // '...'[opt] |
| if (Tok.is(tok::ellipsis)) { |
| ConsumeToken(); |
| if (Tok.is(tok::r_paren)) |
| return TPResult::True(); // '...)' is a sign of a function declarator. |
| else |
| return TPResult::False(); |
| } |
| |
| // An attribute-specifier-seq here is a sign of a function declarator. |
| if (isCXX11AttributeSpecifier(/*Disambiguate*/false, |
| /*OuterMightBeMessageSend*/true)) |
| return TPResult::True(); |
| |
| ParsedAttributes attrs(AttrFactory); |
| MaybeParseMicrosoftAttributes(attrs); |
| |
| // decl-specifier-seq |
| // A parameter-declaration's initializer must be preceded by an '=', so |
| // decl-specifier-seq '{' is not a parameter in C++11. |
| TPResult TPR = TryParseDeclarationSpecifier(InvalidAsDeclaration); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| |
| // declarator |
| // abstract-declarator[opt] |
| TPR = TryParseDeclarator(true/*mayBeAbstract*/); |
| if (TPR != TPResult::Ambiguous()) |
| return TPR; |
| |
| // [GNU] attributes[opt] |
| if (Tok.is(tok::kw___attribute)) |
| return TPResult::True(); |
| |
| if (Tok.is(tok::equal)) { |
| // '=' assignment-expression |
| // Parse through assignment-expression. |
| if (!SkipUntil(tok::comma, tok::r_paren, true/*StopAtSemi*/, |
| true/*DontConsume*/)) |
| return TPResult::Error(); |
| } |
| |
| if (Tok.is(tok::ellipsis)) { |
| ConsumeToken(); |
| if (Tok.is(tok::r_paren)) |
| return TPResult::True(); // '...)' is a sign of a function declarator. |
| else |
| return TPResult::False(); |
| } |
| |
| if (Tok.isNot(tok::comma)) |
| break; |
| ConsumeToken(); // the comma. |
| } |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| /// TryParseFunctionDeclarator - We parsed a '(' and we want to try to continue |
| /// parsing as a function declarator. |
| /// If TryParseFunctionDeclarator fully parsed the function declarator, it will |
| /// return TPResult::Ambiguous(), otherwise it will return either False() or |
| /// Error(). |
| /// |
| /// '(' parameter-declaration-clause ')' cv-qualifier-seq[opt] |
| /// exception-specification[opt] |
| /// |
| /// exception-specification: |
| /// 'throw' '(' type-id-list[opt] ')' |
| /// |
| Parser::TPResult Parser::TryParseFunctionDeclarator() { |
| |
| // The '(' is already parsed. |
| |
| TPResult TPR = TryParseParameterDeclarationClause(); |
| if (TPR == TPResult::Ambiguous() && Tok.isNot(tok::r_paren)) |
| TPR = TPResult::False(); |
| |
| if (TPR == TPResult::False() || TPR == TPResult::Error()) |
| return TPR; |
| |
| // Parse through the parens. |
| if (!SkipUntil(tok::r_paren)) |
| return TPResult::Error(); |
| |
| // cv-qualifier-seq |
| while (Tok.is(tok::kw_const) || |
| Tok.is(tok::kw_volatile) || |
| Tok.is(tok::kw_restrict) ) |
| ConsumeToken(); |
| |
| // ref-qualifier[opt] |
| if (Tok.is(tok::amp) || Tok.is(tok::ampamp)) |
| ConsumeToken(); |
| |
| // exception-specification |
| if (Tok.is(tok::kw_throw)) { |
| ConsumeToken(); |
| if (Tok.isNot(tok::l_paren)) |
| return TPResult::Error(); |
| |
| // Parse through the parens after 'throw'. |
| ConsumeParen(); |
| if (!SkipUntil(tok::r_paren)) |
| return TPResult::Error(); |
| } |
| if (Tok.is(tok::kw_noexcept)) { |
| ConsumeToken(); |
| // Possibly an expression as well. |
| if (Tok.is(tok::l_paren)) { |
| // Find the matching rparen. |
| ConsumeParen(); |
| if (!SkipUntil(tok::r_paren)) |
| return TPResult::Error(); |
| } |
| } |
| |
| return TPResult::Ambiguous(); |
| } |
| |
| /// '[' constant-expression[opt] ']' |
| /// |
| Parser::TPResult Parser::TryParseBracketDeclarator() { |
| ConsumeBracket(); |
| if (!SkipUntil(tok::r_square)) |
| return TPResult::Error(); |
| |
| return TPResult::Ambiguous(); |
| } |