| //===--- Parser.cpp - C Language Family Parser ----------------------------===// |
| // |
| // 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 Parser interfaces. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Parse/Parser.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Parse/Scope.h" |
| #include "ExtensionRAIIObject.h" |
| #include "ParsePragma.h" |
| using namespace clang; |
| |
| Parser::Parser(Preprocessor &pp, Action &actions) |
| : PP(pp), Actions(actions), Diags(PP.getDiagnostics()) { |
| Tok.setKind(tok::eof); |
| CurScope = 0; |
| NumCachedScopes = 0; |
| ParenCount = BracketCount = BraceCount = 0; |
| ObjCImpDecl = 0; |
| |
| // Add #pragma handlers. These are removed and destroyed in the |
| // destructor. |
| PackHandler = |
| new PragmaPackHandler(&PP.getIdentifierTable().get("pack"), actions); |
| PP.AddPragmaHandler(0, PackHandler); |
| |
| // Instantiate a LexedMethodsForTopClass for all the non-nested classes. |
| PushTopClassStack(); |
| } |
| |
| /// Out-of-line virtual destructor to provide home for Action class. |
| Action::~Action() {} |
| |
| |
| DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) { |
| return Diags.Report(FullSourceLoc(Loc,PP.getSourceManager()), DiagID); |
| } |
| |
| DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) { |
| return Diag(Tok.getLocation(), DiagID); |
| } |
| |
| /// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'), |
| /// this helper function matches and consumes the specified RHS token if |
| /// present. If not present, it emits the specified diagnostic indicating |
| /// that the parser failed to match the RHS of the token at LHSLoc. LHSName |
| /// should be the name of the unmatched LHS token. |
| SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok, |
| SourceLocation LHSLoc) { |
| |
| if (Tok.is(RHSTok)) |
| return ConsumeAnyToken(); |
| |
| SourceLocation R = Tok.getLocation(); |
| const char *LHSName = "unknown"; |
| diag::kind DID = diag::err_parse_error; |
| switch (RHSTok) { |
| default: break; |
| case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break; |
| case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break; |
| case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break; |
| case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break; |
| } |
| Diag(Tok, DID); |
| Diag(LHSLoc, diag::note_matching) << LHSName; |
| SkipUntil(RHSTok); |
| return R; |
| } |
| |
| /// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the |
| /// input. If so, it is consumed and false is returned. |
| /// |
| /// If the input is malformed, this emits the specified diagnostic. Next, if |
| /// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is |
| /// returned. |
| bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID, |
| const char *Msg, tok::TokenKind SkipToTok) { |
| if (Tok.is(ExpectedTok)) { |
| ConsumeAnyToken(); |
| return false; |
| } |
| |
| Diag(Tok, DiagID) << Msg; |
| if (SkipToTok != tok::unknown) |
| SkipUntil(SkipToTok); |
| return true; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Error recovery. |
| //===----------------------------------------------------------------------===// |
| |
| /// SkipUntil - Read tokens until we get to the specified token, then consume |
| /// it (unless DontConsume is true). Because we cannot guarantee that the |
| /// token will ever occur, this skips to the next token, or to some likely |
| /// good stopping point. If StopAtSemi is true, skipping will stop at a ';' |
| /// character. |
| /// |
| /// If SkipUntil finds the specified token, it returns true, otherwise it |
| /// returns false. |
| bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks, |
| bool StopAtSemi, bool DontConsume) { |
| // We always want this function to skip at least one token if the first token |
| // isn't T and if not at EOF. |
| bool isFirstTokenSkipped = true; |
| while (1) { |
| // If we found one of the tokens, stop and return true. |
| for (unsigned i = 0; i != NumToks; ++i) { |
| if (Tok.is(Toks[i])) { |
| if (DontConsume) { |
| // Noop, don't consume the token. |
| } else { |
| ConsumeAnyToken(); |
| } |
| return true; |
| } |
| } |
| |
| switch (Tok.getKind()) { |
| case tok::eof: |
| // Ran out of tokens. |
| return false; |
| |
| case tok::l_paren: |
| // Recursively skip properly-nested parens. |
| ConsumeParen(); |
| SkipUntil(tok::r_paren, false); |
| break; |
| case tok::l_square: |
| // Recursively skip properly-nested square brackets. |
| ConsumeBracket(); |
| SkipUntil(tok::r_square, false); |
| break; |
| case tok::l_brace: |
| // Recursively skip properly-nested braces. |
| ConsumeBrace(); |
| SkipUntil(tok::r_brace, false); |
| break; |
| |
| // Okay, we found a ']' or '}' or ')', which we think should be balanced. |
| // Since the user wasn't looking for this token (if they were, it would |
| // already be handled), this isn't balanced. If there is a LHS token at a |
| // higher level, we will assume that this matches the unbalanced token |
| // and return it. Otherwise, this is a spurious RHS token, which we skip. |
| case tok::r_paren: |
| if (ParenCount && !isFirstTokenSkipped) |
| return false; // Matches something. |
| ConsumeParen(); |
| break; |
| case tok::r_square: |
| if (BracketCount && !isFirstTokenSkipped) |
| return false; // Matches something. |
| ConsumeBracket(); |
| break; |
| case tok::r_brace: |
| if (BraceCount && !isFirstTokenSkipped) |
| return false; // Matches something. |
| ConsumeBrace(); |
| break; |
| |
| case tok::string_literal: |
| case tok::wide_string_literal: |
| ConsumeStringToken(); |
| break; |
| case tok::semi: |
| if (StopAtSemi) |
| return false; |
| // FALL THROUGH. |
| default: |
| // Skip this token. |
| ConsumeToken(); |
| break; |
| } |
| isFirstTokenSkipped = false; |
| } |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Scope manipulation |
| //===----------------------------------------------------------------------===// |
| |
| /// EnterScope - Start a new scope. |
| void Parser::EnterScope(unsigned ScopeFlags) { |
| if (NumCachedScopes) { |
| Scope *N = ScopeCache[--NumCachedScopes]; |
| N->Init(CurScope, ScopeFlags); |
| CurScope = N; |
| } else { |
| CurScope = new Scope(CurScope, ScopeFlags); |
| } |
| } |
| |
| /// ExitScope - Pop a scope off the scope stack. |
| void Parser::ExitScope() { |
| assert(CurScope && "Scope imbalance!"); |
| |
| // Inform the actions module that this scope is going away if there are any |
| // decls in it. |
| if (!CurScope->decl_empty()) |
| Actions.ActOnPopScope(Tok.getLocation(), CurScope); |
| |
| Scope *OldScope = CurScope; |
| CurScope = OldScope->getParent(); |
| |
| if (NumCachedScopes == ScopeCacheSize) |
| delete OldScope; |
| else |
| ScopeCache[NumCachedScopes++] = OldScope; |
| } |
| |
| |
| |
| |
| //===----------------------------------------------------------------------===// |
| // C99 6.9: External Definitions. |
| //===----------------------------------------------------------------------===// |
| |
| Parser::~Parser() { |
| // If we still have scopes active, delete the scope tree. |
| delete CurScope; |
| |
| // Free the scope cache. |
| for (unsigned i = 0, e = NumCachedScopes; i != e; ++i) |
| delete ScopeCache[i]; |
| |
| // Remove the pragma handlers we installed. |
| PP.RemovePragmaHandler(0, PackHandler); |
| delete PackHandler; |
| } |
| |
| /// Initialize - Warm up the parser. |
| /// |
| void Parser::Initialize() { |
| // Prime the lexer look-ahead. |
| ConsumeToken(); |
| |
| // Create the translation unit scope. Install it as the current scope. |
| assert(CurScope == 0 && "A scope is already active?"); |
| EnterScope(Scope::DeclScope); |
| Actions.ActOnTranslationUnitScope(Tok.getLocation(), CurScope); |
| |
| if (Tok.is(tok::eof) && |
| !getLang().CPlusPlus) // Empty source file is an extension in C |
| Diag(Tok, diag::ext_empty_source_file); |
| |
| // Initialization for Objective-C context sensitive keywords recognition. |
| // Referenced in Parser::ParseObjCTypeQualifierList. |
| if (getLang().ObjC1) { |
| ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in"); |
| ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out"); |
| ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout"); |
| ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway"); |
| ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy"); |
| ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref"); |
| } |
| |
| Ident_super = &PP.getIdentifierTable().get("super"); |
| } |
| |
| /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the |
| /// action tells us to. This returns true if the EOF was encountered. |
| bool Parser::ParseTopLevelDecl(DeclTy*& Result) { |
| Result = 0; |
| if (Tok.is(tok::eof)) { |
| Actions.ActOnEndOfTranslationUnit(); |
| return true; |
| } |
| |
| Result = ParseExternalDeclaration(); |
| return false; |
| } |
| |
| /// ParseTranslationUnit: |
| /// translation-unit: [C99 6.9] |
| /// external-declaration |
| /// translation-unit external-declaration |
| void Parser::ParseTranslationUnit() { |
| Initialize(); // pushes a scope. |
| |
| DeclTy *Res; |
| while (!ParseTopLevelDecl(Res)) |
| /*parse them all*/; |
| |
| ExitScope(); |
| assert(CurScope == 0 && "Scope imbalance!"); |
| } |
| |
| /// ParseExternalDeclaration: |
| /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl] |
| /// function-definition |
| /// declaration |
| /// [EXT] ';' |
| /// [GNU] asm-definition |
| /// [GNU] __extension__ external-declaration |
| /// [OBJC] objc-class-definition |
| /// [OBJC] objc-class-declaration |
| /// [OBJC] objc-alias-declaration |
| /// [OBJC] objc-protocol-definition |
| /// [OBJC] objc-method-definition |
| /// [OBJC] @end |
| /// [C++] linkage-specification |
| /// [GNU] asm-definition: |
| /// simple-asm-expr ';' |
| /// |
| Parser::DeclTy *Parser::ParseExternalDeclaration() { |
| switch (Tok.getKind()) { |
| case tok::semi: |
| Diag(Tok, diag::ext_top_level_semi); |
| ConsumeToken(); |
| // TODO: Invoke action for top-level semicolon. |
| return 0; |
| case tok::kw___extension__: { |
| // __extension__ silences extension warnings in the subexpression. |
| ExtensionRAIIObject O(Diags); // Use RAII to do this. |
| ConsumeToken(); |
| return ParseExternalDeclaration(); |
| } |
| case tok::kw_asm: { |
| ExprResult Result = ParseSimpleAsm(); |
| |
| ExpectAndConsume(tok::semi, diag::err_expected_semi_after, |
| "top-level asm block"); |
| |
| if (!Result.isInvalid) |
| return Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), Result.Val); |
| return 0; |
| } |
| case tok::at: |
| // @ is not a legal token unless objc is enabled, no need to check. |
| return ParseObjCAtDirectives(); |
| case tok::minus: |
| case tok::plus: |
| if (getLang().ObjC1) |
| return ParseObjCMethodDefinition(); |
| else { |
| Diag(Tok, diag::err_expected_external_declaration); |
| ConsumeToken(); |
| } |
| return 0; |
| case tok::kw_namespace: |
| case tok::kw_typedef: |
| // A function definition cannot start with a these keywords. |
| return ParseDeclaration(Declarator::FileContext); |
| default: |
| // We can't tell whether this is a function-definition or declaration yet. |
| return ParseDeclarationOrFunctionDefinition(); |
| } |
| } |
| |
| /// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or |
| /// a declaration. We can't tell which we have until we read up to the |
| /// compound-statement in function-definition. |
| /// |
| /// function-definition: [C99 6.9.1] |
| /// decl-specs declarator declaration-list[opt] compound-statement |
| /// [C90] function-definition: [C99 6.7.1] - implicit int result |
| /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement |
| /// |
| /// declaration: [C99 6.7] |
| /// declaration-specifiers init-declarator-list[opt] ';' |
| /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode] |
| /// [OMP] threadprivate-directive [TODO] |
| /// |
| Parser::DeclTy *Parser::ParseDeclarationOrFunctionDefinition() { |
| // Parse the common declaration-specifiers piece. |
| DeclSpec DS; |
| ParseDeclarationSpecifiers(DS); |
| |
| // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };" |
| // declaration-specifiers init-declarator-list[opt] ';' |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| return Actions.ParsedFreeStandingDeclSpec(CurScope, DS); |
| } |
| |
| // ObjC2 allows prefix attributes on class interfaces and protocols. |
| // FIXME: This still needs better diagnostics. We should only accept |
| // attributes here, no types, etc. |
| if (getLang().ObjC2 && Tok.is(tok::at)) { |
| SourceLocation AtLoc = ConsumeToken(); // the "@" |
| if (!Tok.isObjCAtKeyword(tok::objc_interface) && |
| !Tok.isObjCAtKeyword(tok::objc_protocol)) { |
| Diag(Tok, diag::err_objc_unexpected_attr); |
| SkipUntil(tok::semi); // FIXME: better skip? |
| return 0; |
| } |
| const char *PrevSpec = 0; |
| if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec)) |
| Diag(AtLoc, diag::err_invalid_decl_spec_combination) << PrevSpec; |
| if (Tok.isObjCAtKeyword(tok::objc_protocol)) |
| return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes()); |
| return ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()); |
| } |
| |
| // If the declspec consisted only of 'extern' and we have a string |
| // literal following it, this must be a C++ linkage specifier like |
| // 'extern "C"'. |
| if (Tok.is(tok::string_literal) && getLang().CPlusPlus && |
| DS.getStorageClassSpec() == DeclSpec::SCS_extern && |
| DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) |
| return ParseLinkage(Declarator::FileContext); |
| |
| // Parse the first declarator. |
| Declarator DeclaratorInfo(DS, Declarator::FileContext); |
| ParseDeclarator(DeclaratorInfo); |
| // Error parsing the declarator? |
| if (!DeclaratorInfo.hasName()) { |
| // If so, skip until the semi-colon or a }. |
| SkipUntil(tok::r_brace, true); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| return 0; |
| } |
| |
| // If the declarator is the start of a function definition, handle it. |
| if (Tok.is(tok::equal) || // int X()= -> not a function def |
| Tok.is(tok::comma) || // int X(), -> not a function def |
| Tok.is(tok::semi) || // int X(); -> not a function def |
| Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def |
| Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def |
| (getLang().CPlusPlus && |
| Tok.is(tok::l_paren)) ) { // int X(0) -> not a function def [C++] |
| // FALL THROUGH. |
| } else if (DeclaratorInfo.isFunctionDeclarator() && |
| (Tok.is(tok::l_brace) || // int X() {} |
| ( !getLang().CPlusPlus && |
| isDeclarationSpecifier() ))) { // int X(f) int f; {} |
| if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { |
| Diag(Tok, diag::err_function_declared_typedef); |
| |
| if (Tok.is(tok::l_brace)) { |
| // This recovery skips the entire function body. It would be nice |
| // to simply call ParseFunctionDefintion() below, however Sema |
| // assumes the declarator represents a function, not a typedef. |
| ConsumeBrace(); |
| SkipUntil(tok::r_brace, true); |
| } else { |
| SkipUntil(tok::semi); |
| } |
| return 0; |
| } |
| return ParseFunctionDefinition(DeclaratorInfo); |
| } else { |
| if (DeclaratorInfo.isFunctionDeclarator()) |
| Diag(Tok, diag::err_expected_fn_body); |
| else |
| Diag(Tok, diag::err_expected_after_declarator); |
| SkipUntil(tok::semi); |
| return 0; |
| } |
| |
| // Parse the init-declarator-list for a normal declaration. |
| return ParseInitDeclaratorListAfterFirstDeclarator(DeclaratorInfo); |
| } |
| |
| /// ParseFunctionDefinition - We parsed and verified that the specified |
| /// Declarator is well formed. If this is a K&R-style function, read the |
| /// parameters declaration-list, then start the compound-statement. |
| /// |
| /// function-definition: [C99 6.9.1] |
| /// decl-specs declarator declaration-list[opt] compound-statement |
| /// [C90] function-definition: [C99 6.7.1] - implicit int result |
| /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement |
| /// [C++] function-definition: [C++ 8.4] |
| /// decl-specifier-seq[opt] declarator ctor-initializer[opt] function-body |
| /// [C++] function-definition: [C++ 8.4] |
| /// decl-specifier-seq[opt] declarator function-try-block [TODO] |
| /// |
| Parser::DeclTy *Parser::ParseFunctionDefinition(Declarator &D) { |
| const DeclaratorChunk &FnTypeInfo = D.getTypeObject(0); |
| assert(FnTypeInfo.Kind == DeclaratorChunk::Function && |
| "This isn't a function declarator!"); |
| const DeclaratorChunk::FunctionTypeInfo &FTI = FnTypeInfo.Fun; |
| |
| // If this is C90 and the declspecs were completely missing, fudge in an |
| // implicit int. We do this here because this is the only place where |
| // declaration-specifiers are completely optional in the grammar. |
| if (getLang().ImplicitInt && D.getDeclSpec().getParsedSpecifiers() == 0) { |
| const char *PrevSpec; |
| D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int, |
| D.getIdentifierLoc(), |
| PrevSpec); |
| } |
| |
| // If this declaration was formed with a K&R-style identifier list for the |
| // arguments, parse declarations for all of the args next. |
| // int foo(a,b) int a; float b; {} |
| if (!FTI.hasPrototype && FTI.NumArgs != 0) |
| ParseKNRParamDeclarations(D); |
| |
| // We should have either an opening brace or, in a C++ constructor, |
| // we may have a colon. |
| // FIXME: In C++, we might also find the 'try' keyword. |
| if (Tok.isNot(tok::l_brace) && Tok.isNot(tok::colon)) { |
| Diag(Tok, diag::err_expected_fn_body); |
| |
| // Skip over garbage, until we get to '{'. Don't eat the '{'. |
| SkipUntil(tok::l_brace, true, true); |
| |
| // If we didn't find the '{', bail out. |
| if (Tok.isNot(tok::l_brace)) |
| return 0; |
| } |
| |
| // Enter a scope for the function body. |
| EnterScope(Scope::FnScope|Scope::DeclScope); |
| |
| // Tell the actions module that we have entered a function definition with the |
| // specified Declarator for the function. |
| DeclTy *Res = Actions.ActOnStartOfFunctionDef(CurScope, D); |
| |
| // If we have a colon, then we're probably parsing a C++ |
| // ctor-initializer. |
| if (Tok.is(tok::colon)) |
| ParseConstructorInitializer(Res); |
| |
| SourceLocation BraceLoc = Tok.getLocation(); |
| return ParseFunctionStatementBody(Res, BraceLoc, BraceLoc); |
| } |
| |
| /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides |
| /// types for a function with a K&R-style identifier list for arguments. |
| void Parser::ParseKNRParamDeclarations(Declarator &D) { |
| // We know that the top-level of this declarator is a function. |
| DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; |
| |
| // Enter function-declaration scope, limiting any declarators to the |
| // function prototype scope, including parameter declarators. |
| EnterScope(Scope::FnScope|Scope::DeclScope); |
| |
| // Read all the argument declarations. |
| while (isDeclarationSpecifier()) { |
| SourceLocation DSStart = Tok.getLocation(); |
| |
| // Parse the common declaration-specifiers piece. |
| DeclSpec DS; |
| ParseDeclarationSpecifiers(DS); |
| |
| // C99 6.9.1p6: 'each declaration in the declaration list shall have at |
| // least one declarator'. |
| // NOTE: GCC just makes this an ext-warn. It's not clear what it does with |
| // the declarations though. It's trivial to ignore them, really hard to do |
| // anything else with them. |
| if (Tok.is(tok::semi)) { |
| Diag(DSStart, diag::err_declaration_does_not_declare_param); |
| ConsumeToken(); |
| continue; |
| } |
| |
| // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other |
| // than register. |
| if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && |
| DS.getStorageClassSpec() != DeclSpec::SCS_register) { |
| Diag(DS.getStorageClassSpecLoc(), |
| diag::err_invalid_storage_class_in_func_decl); |
| DS.ClearStorageClassSpecs(); |
| } |
| if (DS.isThreadSpecified()) { |
| Diag(DS.getThreadSpecLoc(), |
| diag::err_invalid_storage_class_in_func_decl); |
| DS.ClearStorageClassSpecs(); |
| } |
| |
| // Parse the first declarator attached to this declspec. |
| Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext); |
| ParseDeclarator(ParmDeclarator); |
| |
| // Handle the full declarator list. |
| while (1) { |
| DeclTy *AttrList; |
| // If attributes are present, parse them. |
| if (Tok.is(tok::kw___attribute)) |
| // FIXME: attach attributes too. |
| AttrList = ParseAttributes(); |
| |
| // Ask the actions module to compute the type for this declarator. |
| Action::DeclTy *Param = |
| Actions.ActOnParamDeclarator(CurScope, ParmDeclarator); |
| |
| if (Param && |
| // A missing identifier has already been diagnosed. |
| ParmDeclarator.getIdentifier()) { |
| |
| // Scan the argument list looking for the correct param to apply this |
| // type. |
| for (unsigned i = 0; ; ++i) { |
| // C99 6.9.1p6: those declarators shall declare only identifiers from |
| // the identifier list. |
| if (i == FTI.NumArgs) { |
| Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param) |
| << ParmDeclarator.getIdentifier(); |
| break; |
| } |
| |
| if (FTI.ArgInfo[i].Ident == ParmDeclarator.getIdentifier()) { |
| // Reject redefinitions of parameters. |
| if (FTI.ArgInfo[i].Param) { |
| Diag(ParmDeclarator.getIdentifierLoc(), |
| diag::err_param_redefinition) |
| << ParmDeclarator.getIdentifier(); |
| } else { |
| FTI.ArgInfo[i].Param = Param; |
| } |
| break; |
| } |
| } |
| } |
| |
| // If we don't have a comma, it is either the end of the list (a ';') or |
| // an error, bail out. |
| if (Tok.isNot(tok::comma)) |
| break; |
| |
| // Consume the comma. |
| ConsumeToken(); |
| |
| // Parse the next declarator. |
| ParmDeclarator.clear(); |
| ParseDeclarator(ParmDeclarator); |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else { |
| Diag(Tok, diag::err_parse_error); |
| // Skip to end of block or statement |
| SkipUntil(tok::semi, true); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| } |
| } |
| |
| // Leave prototype scope. |
| ExitScope(); |
| |
| // The actions module must verify that all arguments were declared. |
| } |
| |
| |
| /// ParseAsmStringLiteral - This is just a normal string-literal, but is not |
| /// allowed to be a wide string, and is not subject to character translation. |
| /// |
| /// [GNU] asm-string-literal: |
| /// string-literal |
| /// |
| Parser::ExprResult Parser::ParseAsmStringLiteral() { |
| if (!isTokenStringLiteral()) { |
| Diag(Tok, diag::err_expected_string_literal); |
| return true; |
| } |
| |
| ExprResult Res = ParseStringLiteralExpression(); |
| if (Res.isInvalid) return true; |
| |
| // TODO: Diagnose: wide string literal in 'asm' |
| |
| return Res; |
| } |
| |
| /// ParseSimpleAsm |
| /// |
| /// [GNU] simple-asm-expr: |
| /// 'asm' '(' asm-string-literal ')' |
| /// |
| Parser::ExprResult Parser::ParseSimpleAsm() { |
| assert(Tok.is(tok::kw_asm) && "Not an asm!"); |
| SourceLocation Loc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after) << "asm"; |
| return true; |
| } |
| |
| ConsumeParen(); |
| |
| ExprResult Result = ParseAsmStringLiteral(); |
| |
| if (Result.isInvalid) |
| SkipUntil(tok::r_paren); |
| else |
| MatchRHSPunctuation(tok::r_paren, Loc); |
| |
| return Result; |
| } |
| |
| /// TryAnnotateTypeOrScopeToken - If the current token position is on a |
| /// typename (possibly qualified in C++) or a C++ scope specifier not followed |
| /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens |
| /// with a single annotation token representing the typename or C++ scope |
| /// respectively. |
| /// This simplifies handling of C++ scope specifiers and allows efficient |
| /// backtracking without the need to re-parse and resolve nested-names and |
| /// typenames. |
| void Parser::TryAnnotateTypeOrScopeToken() { |
| if (Tok.is(tok::annot_qualtypename) || Tok.is(tok::annot_cxxscope)) |
| return; |
| |
| CXXScopeSpec SS; |
| if (getLang().CPlusPlus) |
| MaybeParseCXXScopeSpecifier(SS); |
| |
| if (Tok.is(tok::identifier)) { |
| TypeTy *Ty = Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope, &SS); |
| if (Ty) { |
| // This is a typename. Replace the current token in-place with an |
| // annotation type token. |
| Tok.setKind(tok::annot_qualtypename); |
| Tok.setAnnotationValue(Ty); |
| Tok.setAnnotationEndLoc(Tok.getLocation()); |
| if (SS.isNotEmpty()) // it was a C++ qualified type name. |
| Tok.setLocation(SS.getBeginLoc()); |
| |
| // In case the tokens were cached, have Preprocessor replace them with the |
| // annotation token. |
| PP.AnnotateCachedTokens(Tok); |
| return; |
| } |
| } |
| |
| if (SS.isNotEmpty()) { |
| // A C++ scope specifier that isn't followed by a typename. |
| // Push the current token back into the token stream (or revert it if it is |
| // cached) and use an annotation scope token for current token. |
| if (PP.isBacktrackEnabled()) |
| PP.RevertCachedTokens(1); |
| else |
| PP.EnterToken(Tok); |
| Tok.setKind(tok::annot_cxxscope); |
| Tok.setAnnotationValue(SS.getScopeRep()); |
| Tok.setAnnotationRange(SS.getRange()); |
| |
| // In case the tokens were cached, have Preprocessor replace them with the |
| // annotation token. |
| PP.AnnotateCachedTokens(Tok); |
| } |
| } |
| |
| /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only |
| /// annotates C++ scope specifiers. |
| void Parser::TryAnnotateCXXScopeToken() { |
| assert(getLang().CPlusPlus && |
| "Call sites of this function should be guarded by checking for C++."); |
| |
| if (Tok.is(tok::annot_cxxscope)) |
| return; |
| |
| CXXScopeSpec SS; |
| if (MaybeParseCXXScopeSpecifier(SS)) { |
| |
| // Push the current token back into the token stream (or revert it if it is |
| // cached) and use an annotation scope token for current token. |
| if (PP.isBacktrackEnabled()) |
| PP.RevertCachedTokens(1); |
| else |
| PP.EnterToken(Tok); |
| Tok.setKind(tok::annot_cxxscope); |
| Tok.setAnnotationValue(SS.getScopeRep()); |
| Tok.setAnnotationRange(SS.getRange()); |
| |
| // In case the tokens were cached, have Preprocessor replace them with the |
| // annotation token. |
| PP.AnnotateCachedTokens(Tok); |
| } |
| } |