| //===--- ParseDecl.cpp - Declaration Parsing ------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by Chris Lattner and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Declaration portions of the Parser interfaces. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Parse/Parser.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Parse/Scope.h" |
| #include "llvm/ADT/SmallSet.h" |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // C99 6.7: Declarations. |
| //===----------------------------------------------------------------------===// |
| |
| /// ParseTypeName |
| /// type-name: [C99 6.7.6] |
| /// specifier-qualifier-list abstract-declarator[opt] |
| Parser::TypeTy *Parser::ParseTypeName() { |
| // Parse the common declaration-specifiers piece. |
| DeclSpec DS; |
| ParseSpecifierQualifierList(DS); |
| |
| // Parse the abstract-declarator, if present. |
| Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); |
| ParseDeclarator(DeclaratorInfo); |
| |
| return Actions.ActOnTypeName(CurScope, DeclaratorInfo).Val; |
| } |
| |
| /// ParseAttributes - Parse a non-empty attributes list. |
| /// |
| /// [GNU] attributes: |
| /// attribute |
| /// attributes attribute |
| /// |
| /// [GNU] attribute: |
| /// '__attribute__' '(' '(' attribute-list ')' ')' |
| /// |
| /// [GNU] attribute-list: |
| /// attrib |
| /// attribute_list ',' attrib |
| /// |
| /// [GNU] attrib: |
| /// empty |
| /// attrib-name |
| /// attrib-name '(' identifier ')' |
| /// attrib-name '(' identifier ',' nonempty-expr-list ')' |
| /// attrib-name '(' argument-expression-list [C99 6.5.2] ')' |
| /// |
| /// [GNU] attrib-name: |
| /// identifier |
| /// typespec |
| /// typequal |
| /// storageclass |
| /// |
| /// FIXME: The GCC grammar/code for this construct implies we need two |
| /// token lookahead. Comment from gcc: "If they start with an identifier |
| /// which is followed by a comma or close parenthesis, then the arguments |
| /// start with that identifier; otherwise they are an expression list." |
| /// |
| /// At the moment, I am not doing 2 token lookahead. I am also unaware of |
| /// any attributes that don't work (based on my limited testing). Most |
| /// attributes are very simple in practice. Until we find a bug, I don't see |
| /// a pressing need to implement the 2 token lookahead. |
| |
| AttributeList *Parser::ParseAttributes() { |
| assert(Tok.is(tok::kw___attribute) && "Not an attribute list!"); |
| |
| AttributeList *CurrAttr = 0; |
| |
| while (Tok.is(tok::kw___attribute)) { |
| ConsumeToken(); |
| if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, |
| "attribute")) { |
| SkipUntil(tok::r_paren, true); // skip until ) or ; |
| return CurrAttr; |
| } |
| if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) { |
| SkipUntil(tok::r_paren, true); // skip until ) or ; |
| return CurrAttr; |
| } |
| // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") )) |
| while (Tok.is(tok::identifier) || isDeclarationSpecifier() || |
| Tok.is(tok::comma)) { |
| |
| if (Tok.is(tok::comma)) { |
| // allows for empty/non-empty attributes. ((__vector_size__(16),,,,)) |
| ConsumeToken(); |
| continue; |
| } |
| // we have an identifier or declaration specifier (const, int, etc.) |
| IdentifierInfo *AttrName = Tok.getIdentifierInfo(); |
| SourceLocation AttrNameLoc = ConsumeToken(); |
| |
| // check if we have a "paramterized" attribute |
| if (Tok.is(tok::l_paren)) { |
| ConsumeParen(); // ignore the left paren loc for now |
| |
| if (Tok.is(tok::identifier)) { |
| IdentifierInfo *ParmName = Tok.getIdentifierInfo(); |
| SourceLocation ParmLoc = ConsumeToken(); |
| |
| if (Tok.is(tok::r_paren)) { |
| // __attribute__(( mode(byte) )) |
| ConsumeParen(); // ignore the right paren loc for now |
| CurrAttr = new AttributeList(AttrName, AttrNameLoc, |
| ParmName, ParmLoc, 0, 0, CurrAttr); |
| } else if (Tok.is(tok::comma)) { |
| ConsumeToken(); |
| // __attribute__(( format(printf, 1, 2) )) |
| llvm::SmallVector<ExprTy*, 8> ArgExprs; |
| bool ArgExprsOk = true; |
| |
| // now parse the non-empty comma separated list of expressions |
| while (1) { |
| ExprResult ArgExpr = ParseAssignmentExpression(); |
| if (ArgExpr.isInvalid) { |
| ArgExprsOk = false; |
| SkipUntil(tok::r_paren); |
| break; |
| } else { |
| ArgExprs.push_back(ArgExpr.Val); |
| } |
| if (Tok.isNot(tok::comma)) |
| break; |
| ConsumeToken(); // Eat the comma, move to the next argument |
| } |
| if (ArgExprsOk && Tok.is(tok::r_paren)) { |
| ConsumeParen(); // ignore the right paren loc for now |
| CurrAttr = new AttributeList(AttrName, AttrNameLoc, ParmName, |
| ParmLoc, &ArgExprs[0], ArgExprs.size(), CurrAttr); |
| } |
| } |
| } else { // not an identifier |
| // parse a possibly empty comma separated list of expressions |
| if (Tok.is(tok::r_paren)) { |
| // __attribute__(( nonnull() )) |
| ConsumeParen(); // ignore the right paren loc for now |
| CurrAttr = new AttributeList(AttrName, AttrNameLoc, |
| 0, SourceLocation(), 0, 0, CurrAttr); |
| } else { |
| // __attribute__(( aligned(16) )) |
| llvm::SmallVector<ExprTy*, 8> ArgExprs; |
| bool ArgExprsOk = true; |
| |
| // now parse the list of expressions |
| while (1) { |
| ExprResult ArgExpr = ParseAssignmentExpression(); |
| if (ArgExpr.isInvalid) { |
| ArgExprsOk = false; |
| SkipUntil(tok::r_paren); |
| break; |
| } else { |
| ArgExprs.push_back(ArgExpr.Val); |
| } |
| if (Tok.isNot(tok::comma)) |
| break; |
| ConsumeToken(); // Eat the comma, move to the next argument |
| } |
| // Match the ')'. |
| if (ArgExprsOk && Tok.is(tok::r_paren)) { |
| ConsumeParen(); // ignore the right paren loc for now |
| CurrAttr = new AttributeList(AttrName, AttrNameLoc, 0, |
| SourceLocation(), &ArgExprs[0], ArgExprs.size(), |
| CurrAttr); |
| } |
| } |
| } |
| } else { |
| CurrAttr = new AttributeList(AttrName, AttrNameLoc, |
| 0, SourceLocation(), 0, 0, CurrAttr); |
| } |
| } |
| if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen)) |
| SkipUntil(tok::r_paren, false); |
| if (ExpectAndConsume(tok::r_paren, diag::err_expected_rparen)) |
| SkipUntil(tok::r_paren, false); |
| } |
| return CurrAttr; |
| } |
| |
| /// ParseDeclaration - Parse a full 'declaration', which consists of |
| /// declaration-specifiers, some number of declarators, and a semicolon. |
| /// 'Context' should be a Declarator::TheContext value. |
| /// |
| /// declaration: [C99 6.7] |
| /// block-declaration -> |
| /// simple-declaration |
| /// others [FIXME] |
| /// [C++] namespace-definition |
| /// others... [FIXME] |
| /// |
| Parser::DeclTy *Parser::ParseDeclaration(unsigned Context) { |
| switch (Tok.getKind()) { |
| case tok::kw_namespace: |
| return ParseNamespace(Context); |
| default: |
| return ParseSimpleDeclaration(Context); |
| } |
| } |
| |
| /// simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl] |
| /// declaration-specifiers init-declarator-list[opt] ';' |
| ///[C90/C++]init-declarator-list ';' [TODO] |
| /// [OMP] threadprivate-directive [TODO] |
| Parser::DeclTy *Parser::ParseSimpleDeclaration(unsigned Context) { |
| // 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); |
| } |
| |
| Declarator DeclaratorInfo(DS, (Declarator::TheContext)Context); |
| ParseDeclarator(DeclaratorInfo); |
| |
| return ParseInitDeclaratorListAfterFirstDeclarator(DeclaratorInfo); |
| } |
| |
| |
| /// ParseInitDeclaratorListAfterFirstDeclarator - Parse 'declaration' after |
| /// parsing 'declaration-specifiers declarator'. This method is split out this |
| /// way to handle the ambiguity between top-level function-definitions and |
| /// declarations. |
| /// |
| /// init-declarator-list: [C99 6.7] |
| /// init-declarator |
| /// init-declarator-list ',' init-declarator |
| /// init-declarator: [C99 6.7] |
| /// declarator |
| /// declarator '=' initializer |
| /// [GNU] declarator simple-asm-expr[opt] attributes[opt] |
| /// [GNU] declarator simple-asm-expr[opt] attributes[opt] '=' initializer |
| /// |
| Parser::DeclTy *Parser:: |
| ParseInitDeclaratorListAfterFirstDeclarator(Declarator &D) { |
| |
| // Declarators may be grouped together ("int X, *Y, Z();"). Provide info so |
| // that they can be chained properly if the actions want this. |
| Parser::DeclTy *LastDeclInGroup = 0; |
| |
| // At this point, we know that it is not a function definition. Parse the |
| // rest of the init-declarator-list. |
| while (1) { |
| // If a simple-asm-expr is present, parse it. |
| if (Tok.is(tok::kw_asm)) |
| ParseSimpleAsm(); |
| |
| // If attributes are present, parse them. |
| if (Tok.is(tok::kw___attribute)) |
| D.AddAttributes(ParseAttributes()); |
| |
| // Inform the current actions module that we just parsed this declarator. |
| // FIXME: pass asm & attributes. |
| LastDeclInGroup = Actions.ActOnDeclarator(CurScope, D, LastDeclInGroup); |
| |
| // Parse declarator '=' initializer. |
| ExprResult Init; |
| if (Tok.is(tok::equal)) { |
| ConsumeToken(); |
| Init = ParseInitializer(); |
| if (Init.isInvalid) { |
| SkipUntil(tok::semi); |
| return 0; |
| } |
| Actions.AddInitializerToDecl(LastDeclInGroup, Init.Val); |
| } |
| |
| // 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. |
| D.clear(); |
| ParseDeclarator(D); |
| } |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| return Actions.FinalizeDeclaratorGroup(CurScope, LastDeclInGroup); |
| } |
| |
| Diag(Tok, diag::err_parse_error); |
| // Skip to end of block or statement |
| SkipUntil(tok::r_brace, true, true); |
| if (Tok.is(tok::semi)) |
| ConsumeToken(); |
| return 0; |
| } |
| |
| /// ParseSpecifierQualifierList |
| /// specifier-qualifier-list: |
| /// type-specifier specifier-qualifier-list[opt] |
| /// type-qualifier specifier-qualifier-list[opt] |
| /// [GNU] attributes specifier-qualifier-list[opt] |
| /// |
| void Parser::ParseSpecifierQualifierList(DeclSpec &DS) { |
| /// specifier-qualifier-list is a subset of declaration-specifiers. Just |
| /// parse declaration-specifiers and complain about extra stuff. |
| ParseDeclarationSpecifiers(DS); |
| |
| // Validate declspec for type-name. |
| unsigned Specs = DS.getParsedSpecifiers(); |
| if (Specs == DeclSpec::PQ_None) |
| Diag(Tok, diag::err_typename_requires_specqual); |
| |
| // Issue diagnostic and remove storage class if present. |
| if (Specs & DeclSpec::PQ_StorageClassSpecifier) { |
| if (DS.getStorageClassSpecLoc().isValid()) |
| Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass); |
| else |
| Diag(DS.getThreadSpecLoc(), diag::err_typename_invalid_storageclass); |
| DS.ClearStorageClassSpecs(); |
| } |
| |
| // Issue diagnostic and remove function specfier if present. |
| if (Specs & DeclSpec::PQ_FunctionSpecifier) { |
| Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec); |
| DS.ClearFunctionSpecs(); |
| } |
| } |
| |
| /// ParseDeclarationSpecifiers |
| /// declaration-specifiers: [C99 6.7] |
| /// storage-class-specifier declaration-specifiers[opt] |
| /// type-specifier declaration-specifiers[opt] |
| /// type-qualifier declaration-specifiers[opt] |
| /// [C99] function-specifier declaration-specifiers[opt] |
| /// [GNU] attributes declaration-specifiers[opt] |
| /// |
| /// storage-class-specifier: [C99 6.7.1] |
| /// 'typedef' |
| /// 'extern' |
| /// 'static' |
| /// 'auto' |
| /// 'register' |
| /// [GNU] '__thread' |
| /// type-specifier: [C99 6.7.2] |
| /// 'void' |
| /// 'char' |
| /// 'short' |
| /// 'int' |
| /// 'long' |
| /// 'float' |
| /// 'double' |
| /// 'signed' |
| /// 'unsigned' |
| /// struct-or-union-specifier |
| /// enum-specifier |
| /// typedef-name |
| /// [C++] 'bool' |
| /// [C99] '_Bool' |
| /// [C99] '_Complex' |
| /// [C99] '_Imaginary' // Removed in TC2? |
| /// [GNU] '_Decimal32' |
| /// [GNU] '_Decimal64' |
| /// [GNU] '_Decimal128' |
| /// [GNU] typeof-specifier |
| /// [OBJC] class-name objc-protocol-refs[opt] [TODO] |
| /// [OBJC] typedef-name objc-protocol-refs[opt] [TODO] |
| /// type-qualifier: |
| /// 'const' |
| /// 'volatile' |
| /// [C99] 'restrict' |
| /// function-specifier: [C99 6.7.4] |
| /// [C99] 'inline' |
| /// |
| void Parser::ParseDeclarationSpecifiers(DeclSpec &DS) { |
| DS.Range.setBegin(Tok.getLocation()); |
| while (1) { |
| int isInvalid = false; |
| const char *PrevSpec = 0; |
| SourceLocation Loc = Tok.getLocation(); |
| |
| switch (Tok.getKind()) { |
| // typedef-name |
| case tok::identifier: |
| // This identifier can only be a typedef name if we haven't already seen |
| // a type-specifier. Without this check we misparse: |
| // typedef int X; struct Y { short X; }; as 'short int'. |
| if (!DS.hasTypeSpecifier()) { |
| // It has to be available as a typedef too! |
| if (void *TypeRep = Actions.isTypeName(*Tok.getIdentifierInfo(), |
| CurScope)) { |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typedef, Loc, PrevSpec, |
| TypeRep); |
| if (isInvalid) |
| break; |
| // FIXME: restrict this to "id" and ObjC classnames. |
| DS.Range.setEnd(Tok.getLocation()); |
| ConsumeToken(); // The identifier |
| if (Tok.is(tok::less)) { |
| SourceLocation endProtoLoc; |
| llvm::SmallVector<IdentifierInfo *, 8> ProtocolRefs; |
| ParseObjCProtocolReferences(ProtocolRefs, endProtoLoc); |
| llvm::SmallVector<DeclTy *, 8> *ProtocolDecl = |
| new llvm::SmallVector<DeclTy *, 8>; |
| DS.setProtocolQualifiers(ProtocolDecl); |
| Actions.FindProtocolDeclaration(Loc, |
| &ProtocolRefs[0], ProtocolRefs.size(), |
| *ProtocolDecl); |
| } |
| continue; |
| } |
| } |
| // FALL THROUGH. |
| default: |
| // If this is not a declaration specifier token, we're done reading decl |
| // specifiers. First verify that DeclSpec's are consistent. |
| DS.Finish(Diags, getLang()); |
| return; |
| |
| // GNU attributes support. |
| case tok::kw___attribute: |
| DS.AddAttributes(ParseAttributes()); |
| continue; |
| |
| // storage-class-specifier |
| case tok::kw_typedef: |
| isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_typedef, Loc, PrevSpec); |
| break; |
| case tok::kw_extern: |
| if (DS.isThreadSpecified()) |
| Diag(Tok, diag::ext_thread_before, "extern"); |
| isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_extern, Loc, PrevSpec); |
| break; |
| case tok::kw_static: |
| if (DS.isThreadSpecified()) |
| Diag(Tok, diag::ext_thread_before, "static"); |
| isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_static, Loc, PrevSpec); |
| break; |
| case tok::kw_auto: |
| isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_auto, Loc, PrevSpec); |
| break; |
| case tok::kw_register: |
| isInvalid = DS.SetStorageClassSpec(DeclSpec::SCS_register, Loc, PrevSpec); |
| break; |
| case tok::kw___thread: |
| isInvalid = DS.SetStorageClassSpecThread(Loc, PrevSpec)*2; |
| break; |
| |
| // type-specifiers |
| case tok::kw_short: |
| isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec); |
| break; |
| case tok::kw_long: |
| if (DS.getTypeSpecWidth() != DeclSpec::TSW_long) |
| isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec); |
| else |
| isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec); |
| break; |
| case tok::kw_signed: |
| isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec); |
| break; |
| case tok::kw_unsigned: |
| isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec); |
| break; |
| case tok::kw__Complex: |
| isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec); |
| break; |
| case tok::kw__Imaginary: |
| isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec); |
| break; |
| case tok::kw_void: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec); |
| break; |
| case tok::kw_char: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec); |
| break; |
| case tok::kw_int: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec); |
| break; |
| case tok::kw_float: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec); |
| break; |
| case tok::kw_double: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec); |
| break; |
| case tok::kw_bool: // [C++ 2.11p1] |
| case tok::kw__Bool: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec); |
| break; |
| case tok::kw__Decimal32: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec); |
| break; |
| case tok::kw__Decimal64: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec); |
| break; |
| case tok::kw__Decimal128: |
| isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec); |
| break; |
| |
| case tok::kw_struct: |
| case tok::kw_union: |
| ParseStructUnionSpecifier(DS); |
| continue; |
| case tok::kw_enum: |
| ParseEnumSpecifier(DS); |
| continue; |
| |
| // GNU typeof support. |
| case tok::kw_typeof: |
| ParseTypeofSpecifier(DS); |
| continue; |
| |
| // type-qualifier |
| case tok::kw_const: |
| isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec, |
| getLang())*2; |
| break; |
| case tok::kw_volatile: |
| isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, |
| getLang())*2; |
| break; |
| case tok::kw_restrict: |
| isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, |
| getLang())*2; |
| break; |
| |
| // function-specifier |
| case tok::kw_inline: |
| isInvalid = DS.SetFunctionSpecInline(Loc, PrevSpec); |
| break; |
| } |
| // If the specifier combination wasn't legal, issue a diagnostic. |
| if (isInvalid) { |
| assert(PrevSpec && "Method did not return previous specifier!"); |
| if (isInvalid == 1) // Error. |
| Diag(Tok, diag::err_invalid_decl_spec_combination, PrevSpec); |
| else // extwarn. |
| Diag(Tok, diag::ext_duplicate_declspec, PrevSpec); |
| } |
| DS.Range.setEnd(Tok.getLocation()); |
| ConsumeToken(); |
| } |
| } |
| |
| /// ParseObjcTypeQualifierList - This routine parses the objective-c's type |
| /// qualifier list and builds their bitmask representation in the input |
| /// argument. |
| void Parser::ParseObjcTypeQualifierList(ObjcDeclSpec &DS) { |
| bool found = true; |
| while (found) { |
| found = false; |
| if (Tok.is(tok::identifier)) { |
| const IdentifierInfo *II = Tok.getIdentifierInfo(); |
| unsigned i; |
| for (i = 0; i < objc_NumQuals; ++i) { |
| if (II == ObjcTypeQuals[i]) { |
| switch (i) { |
| case objc_in: |
| DS.setObjcDeclQualifier(ObjcDeclSpec::DQ_In); |
| ConsumeToken(); |
| found = true; |
| break; |
| case objc_out: |
| DS.setObjcDeclQualifier(ObjcDeclSpec::DQ_Out); |
| ConsumeToken(); |
| found = true; |
| break; |
| case objc_inout: |
| DS.setObjcDeclQualifier(ObjcDeclSpec::DQ_Inout); |
| ConsumeToken(); |
| found = true; |
| break; |
| case objc_oneway: |
| DS.setObjcDeclQualifier(ObjcDeclSpec::DQ_Oneway); |
| ConsumeToken(); |
| found = true; |
| break; |
| case objc_bycopy: |
| DS.setObjcDeclQualifier(ObjcDeclSpec::DQ_Bycopy); |
| ConsumeToken(); |
| found = true; |
| break; |
| case objc_byref: |
| DS.setObjcDeclQualifier(ObjcDeclSpec::DQ_Byref); |
| ConsumeToken(); |
| found = true; |
| break; |
| } |
| if (found) |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| /// ParseTag - Parse "struct-or-union-or-class-or-enum identifier[opt]", where |
| /// the first token has already been read and has been turned into an instance |
| /// of DeclSpec::TST (TagType). This returns true if there is an error parsing, |
| /// otherwise it returns false and fills in Decl. |
| bool Parser::ParseTag(DeclTy *&Decl, unsigned TagType, SourceLocation StartLoc){ |
| AttributeList *Attr = 0; |
| // If attributes exist after tag, parse them. |
| if (Tok.is(tok::kw___attribute)) |
| Attr = ParseAttributes(); |
| |
| // Must have either 'struct name' or 'struct {...}'. |
| if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace)) { |
| Diag(Tok, diag::err_expected_ident_lbrace); |
| |
| // Skip the rest of this declarator, up until the comma or semicolon. |
| SkipUntil(tok::comma, true); |
| return true; |
| } |
| |
| // If an identifier is present, consume and remember it. |
| IdentifierInfo *Name = 0; |
| SourceLocation NameLoc; |
| if (Tok.is(tok::identifier)) { |
| Name = Tok.getIdentifierInfo(); |
| NameLoc = ConsumeToken(); |
| } |
| |
| // There are three options here. If we have 'struct foo;', then this is a |
| // forward declaration. If we have 'struct foo {...' then this is a |
| // definition. Otherwise we have something like 'struct foo xyz', a reference. |
| // |
| // This is needed to handle stuff like this right (C99 6.7.2.3p11): |
| // struct foo {..}; void bar() { struct foo; } <- new foo in bar. |
| // struct foo {..}; void bar() { struct foo x; } <- use of old foo. |
| // |
| Action::TagKind TK; |
| if (Tok.is(tok::l_brace)) |
| TK = Action::TK_Definition; |
| else if (Tok.is(tok::semi)) |
| TK = Action::TK_Declaration; |
| else |
| TK = Action::TK_Reference; |
| Decl = Actions.ActOnTag(CurScope, TagType, TK, StartLoc, Name, NameLoc, Attr); |
| return false; |
| } |
| |
| |
| /// ParseStructUnionSpecifier |
| /// struct-or-union-specifier: [C99 6.7.2.1] |
| /// struct-or-union identifier[opt] '{' struct-contents '}' |
| /// struct-or-union identifier |
| /// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents |
| /// '}' attributes[opt] |
| /// [GNU] struct-or-union attributes[opt] identifier |
| /// struct-or-union: |
| /// 'struct' |
| /// 'union' |
| /// |
| void Parser::ParseStructUnionSpecifier(DeclSpec &DS) { |
| assert((Tok.is(tok::kw_struct) || Tok.is(tok::kw_union)) && |
| "Not a struct/union specifier"); |
| DeclSpec::TST TagType = |
| Tok.is(tok::kw_union) ? DeclSpec::TST_union : DeclSpec::TST_struct; |
| SourceLocation StartLoc = ConsumeToken(); |
| |
| // Parse the tag portion of this. |
| DeclTy *TagDecl; |
| if (ParseTag(TagDecl, TagType, StartLoc)) |
| return; |
| |
| // If there is a body, parse it and inform the actions module. |
| if (Tok.is(tok::l_brace)) |
| ParseStructUnionBody(StartLoc, TagType, TagDecl); |
| |
| const char *PrevSpec = 0; |
| if (DS.SetTypeSpecType(TagType, StartLoc, PrevSpec, TagDecl)) |
| Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec); |
| } |
| |
| /// ParseStructDeclaration - Parse a struct declaration without the terminating |
| /// semicolon. |
| /// |
| /// struct-declaration: |
| /// specifier-qualifier-list struct-declarator-list |
| /// [GNU] __extension__ struct-declaration |
| /// [GNU] specifier-qualifier-list |
| /// struct-declarator-list: |
| /// struct-declarator |
| /// struct-declarator-list ',' struct-declarator |
| /// [GNU] struct-declarator-list ',' attributes[opt] struct-declarator |
| /// struct-declarator: |
| /// declarator |
| /// [GNU] declarator attributes[opt] |
| /// declarator[opt] ':' constant-expression |
| /// [GNU] declarator[opt] ':' constant-expression attributes[opt] |
| /// |
| void Parser::ParseStructDeclaration(DeclTy *TagDecl, |
| llvm::SmallVectorImpl<DeclTy*> &FieldDecls) { |
| // FIXME: When __extension__ is specified, disable extension diagnostics. |
| if (Tok.is(tok::kw___extension__)) |
| ConsumeToken(); |
| |
| // Parse the common specifier-qualifiers-list piece. |
| DeclSpec DS; |
| SourceLocation SpecQualLoc = Tok.getLocation(); |
| ParseSpecifierQualifierList(DS); |
| // TODO: Does specifier-qualifier list correctly check that *something* is |
| // specified? |
| |
| // If there are no declarators, issue a warning. |
| if (Tok.is(tok::semi)) { |
| Diag(SpecQualLoc, diag::w_no_declarators); |
| return; |
| } |
| |
| // Read struct-declarators until we find the semicolon. |
| Declarator DeclaratorInfo(DS, Declarator::MemberContext); |
| |
| while (1) { |
| /// struct-declarator: declarator |
| /// struct-declarator: declarator[opt] ':' constant-expression |
| if (Tok.isNot(tok::colon)) |
| ParseDeclarator(DeclaratorInfo); |
| |
| ExprTy *BitfieldSize = 0; |
| if (Tok.is(tok::colon)) { |
| ConsumeToken(); |
| ExprResult Res = ParseConstantExpression(); |
| if (Res.isInvalid) { |
| SkipUntil(tok::semi, true, true); |
| } else { |
| BitfieldSize = Res.Val; |
| } |
| } |
| |
| // If attributes exist after the declarator, parse them. |
| if (Tok.is(tok::kw___attribute)) |
| DeclaratorInfo.AddAttributes(ParseAttributes()); |
| |
| // Install the declarator into the current TagDecl. |
| DeclTy *Field = Actions.ActOnField(CurScope, TagDecl, SpecQualLoc, |
| DeclaratorInfo, BitfieldSize); |
| FieldDecls.push_back(Field); |
| |
| // 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)) |
| return; |
| |
| // Consume the comma. |
| ConsumeToken(); |
| |
| // Parse the next declarator. |
| DeclaratorInfo.clear(); |
| |
| // Attributes are only allowed on the second declarator. |
| if (Tok.is(tok::kw___attribute)) |
| DeclaratorInfo.AddAttributes(ParseAttributes()); |
| } |
| } |
| |
| /// ParseStructUnionBody |
| /// struct-contents: |
| /// struct-declaration-list |
| /// [EXT] empty |
| /// [GNU] "struct-declaration-list" without terminatoring ';' |
| /// struct-declaration-list: |
| /// struct-declaration |
| /// struct-declaration-list struct-declaration |
| /// [OBC] '@' 'defs' '(' class-name ')' [TODO] |
| /// |
| void Parser::ParseStructUnionBody(SourceLocation RecordLoc, |
| unsigned TagType, DeclTy *TagDecl) { |
| SourceLocation LBraceLoc = ConsumeBrace(); |
| |
| // Empty structs are an extension in C (C99 6.7.2.1p7), but are allowed in |
| // C++. |
| if (Tok.is(tok::r_brace)) |
| Diag(Tok, diag::ext_empty_struct_union_enum, |
| DeclSpec::getSpecifierName((DeclSpec::TST)TagType)); |
| |
| llvm::SmallVector<DeclTy*, 32> FieldDecls; |
| |
| // While we still have something to read, read the declarations in the struct. |
| while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) { |
| // Each iteration of this loop reads one struct-declaration. |
| |
| // Check for extraneous top-level semicolon. |
| if (Tok.is(tok::semi)) { |
| Diag(Tok, diag::ext_extra_struct_semi); |
| ConsumeToken(); |
| continue; |
| } |
| ParseStructDeclaration(TagDecl, FieldDecls); |
| |
| if (Tok.is(tok::semi)) { |
| ConsumeToken(); |
| } else if (Tok.is(tok::r_brace)) { |
| Diag(Tok.getLocation(), diag::ext_expected_semi_decl_list); |
| break; |
| } else { |
| Diag(Tok, diag::err_expected_semi_decl_list); |
| // Skip to end of block or statement |
| SkipUntil(tok::r_brace, true, true); |
| } |
| } |
| |
| SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc); |
| |
| Actions.ActOnFields(CurScope, |
| RecordLoc,TagDecl,&FieldDecls[0],FieldDecls.size(), |
| LBraceLoc, RBraceLoc); |
| |
| AttributeList *AttrList = 0; |
| // If attributes exist after struct contents, parse them. |
| if (Tok.is(tok::kw___attribute)) |
| AttrList = ParseAttributes(); // FIXME: where should I put them? |
| } |
| |
| |
| /// ParseEnumSpecifier |
| /// enum-specifier: [C99 6.7.2.2] |
| /// 'enum' identifier[opt] '{' enumerator-list '}' |
| /// [C99] 'enum' identifier[opt] '{' enumerator-list ',' '}' |
| /// [GNU] 'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt] |
| /// '}' attributes[opt] |
| /// 'enum' identifier |
| /// [GNU] 'enum' attributes[opt] identifier |
| void Parser::ParseEnumSpecifier(DeclSpec &DS) { |
| assert(Tok.is(tok::kw_enum) && "Not an enum specifier"); |
| SourceLocation StartLoc = ConsumeToken(); |
| |
| // Parse the tag portion of this. |
| DeclTy *TagDecl; |
| if (ParseTag(TagDecl, DeclSpec::TST_enum, StartLoc)) |
| return; |
| |
| if (Tok.is(tok::l_brace)) |
| ParseEnumBody(StartLoc, TagDecl); |
| |
| // TODO: semantic analysis on the declspec for enums. |
| const char *PrevSpec = 0; |
| if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc, PrevSpec, TagDecl)) |
| Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec); |
| } |
| |
| /// ParseEnumBody - Parse a {} enclosed enumerator-list. |
| /// enumerator-list: |
| /// enumerator |
| /// enumerator-list ',' enumerator |
| /// enumerator: |
| /// enumeration-constant |
| /// enumeration-constant '=' constant-expression |
| /// enumeration-constant: |
| /// identifier |
| /// |
| void Parser::ParseEnumBody(SourceLocation StartLoc, DeclTy *EnumDecl) { |
| SourceLocation LBraceLoc = ConsumeBrace(); |
| |
| // C does not allow an empty enumerator-list, C++ does [dcl.enum]. |
| if (Tok.is(tok::r_brace) && !getLang().CPlusPlus) |
| Diag(Tok, diag::ext_empty_struct_union_enum, "enum"); |
| |
| llvm::SmallVector<DeclTy*, 32> EnumConstantDecls; |
| |
| DeclTy *LastEnumConstDecl = 0; |
| |
| // Parse the enumerator-list. |
| while (Tok.is(tok::identifier)) { |
| IdentifierInfo *Ident = Tok.getIdentifierInfo(); |
| SourceLocation IdentLoc = ConsumeToken(); |
| |
| SourceLocation EqualLoc; |
| ExprTy *AssignedVal = 0; |
| if (Tok.is(tok::equal)) { |
| EqualLoc = ConsumeToken(); |
| ExprResult Res = ParseConstantExpression(); |
| if (Res.isInvalid) |
| SkipUntil(tok::comma, tok::r_brace, true, true); |
| else |
| AssignedVal = Res.Val; |
| } |
| |
| // Install the enumerator constant into EnumDecl. |
| DeclTy *EnumConstDecl = Actions.ActOnEnumConstant(CurScope, EnumDecl, |
| LastEnumConstDecl, |
| IdentLoc, Ident, |
| EqualLoc, AssignedVal); |
| EnumConstantDecls.push_back(EnumConstDecl); |
| LastEnumConstDecl = EnumConstDecl; |
| |
| if (Tok.isNot(tok::comma)) |
| break; |
| SourceLocation CommaLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::identifier) && !getLang().C99) |
| Diag(CommaLoc, diag::ext_c99_enumerator_list_comma); |
| } |
| |
| // Eat the }. |
| MatchRHSPunctuation(tok::r_brace, LBraceLoc); |
| |
| Actions.ActOnEnumBody(StartLoc, EnumDecl, &EnumConstantDecls[0], |
| EnumConstantDecls.size()); |
| |
| DeclTy *AttrList = 0; |
| // If attributes exist after the identifier list, parse them. |
| if (Tok.is(tok::kw___attribute)) |
| AttrList = ParseAttributes(); // FIXME: where do they do? |
| } |
| |
| /// isTypeSpecifierQualifier - Return true if the current token could be the |
| /// start of a specifier-qualifier-list. |
| bool Parser::isTypeSpecifierQualifier() const { |
| switch (Tok.getKind()) { |
| default: return false; |
| // GNU attributes support. |
| case tok::kw___attribute: |
| // GNU typeof support. |
| case tok::kw_typeof: |
| |
| // type-specifiers |
| case tok::kw_short: |
| case tok::kw_long: |
| case tok::kw_signed: |
| case tok::kw_unsigned: |
| case tok::kw__Complex: |
| case tok::kw__Imaginary: |
| case tok::kw_void: |
| case tok::kw_char: |
| case tok::kw_int: |
| case tok::kw_float: |
| case tok::kw_double: |
| case tok::kw_bool: |
| case tok::kw__Bool: |
| case tok::kw__Decimal32: |
| case tok::kw__Decimal64: |
| case tok::kw__Decimal128: |
| |
| // struct-or-union-specifier |
| case tok::kw_struct: |
| case tok::kw_union: |
| // enum-specifier |
| case tok::kw_enum: |
| |
| // type-qualifier |
| case tok::kw_const: |
| case tok::kw_volatile: |
| case tok::kw_restrict: |
| return true; |
| |
| // typedef-name |
| case tok::identifier: |
| return Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope) != 0; |
| } |
| } |
| |
| /// isDeclarationSpecifier() - Return true if the current token is part of a |
| /// declaration specifier. |
| bool Parser::isDeclarationSpecifier() const { |
| switch (Tok.getKind()) { |
| default: return false; |
| // storage-class-specifier |
| case tok::kw_typedef: |
| case tok::kw_extern: |
| case tok::kw_static: |
| case tok::kw_auto: |
| case tok::kw_register: |
| case tok::kw___thread: |
| |
| // type-specifiers |
| case tok::kw_short: |
| case tok::kw_long: |
| case tok::kw_signed: |
| case tok::kw_unsigned: |
| case tok::kw__Complex: |
| case tok::kw__Imaginary: |
| case tok::kw_void: |
| case tok::kw_char: |
| case tok::kw_int: |
| case tok::kw_float: |
| case tok::kw_double: |
| case tok::kw_bool: |
| case tok::kw__Bool: |
| case tok::kw__Decimal32: |
| case tok::kw__Decimal64: |
| case tok::kw__Decimal128: |
| |
| // struct-or-union-specifier |
| case tok::kw_struct: |
| case tok::kw_union: |
| // enum-specifier |
| case tok::kw_enum: |
| |
| // type-qualifier |
| case tok::kw_const: |
| case tok::kw_volatile: |
| case tok::kw_restrict: |
| |
| // function-specifier |
| case tok::kw_inline: |
| |
| // GNU typeof support. |
| case tok::kw_typeof: |
| |
| // GNU attributes. |
| case tok::kw___attribute: |
| return true; |
| |
| // typedef-name |
| case tok::identifier: |
| return Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope) != 0; |
| } |
| } |
| |
| |
| /// ParseTypeQualifierListOpt |
| /// type-qualifier-list: [C99 6.7.5] |
| /// type-qualifier |
| /// [GNU] attributes |
| /// type-qualifier-list type-qualifier |
| /// [GNU] type-qualifier-list attributes |
| /// |
| void Parser::ParseTypeQualifierListOpt(DeclSpec &DS) { |
| while (1) { |
| int isInvalid = false; |
| const char *PrevSpec = 0; |
| SourceLocation Loc = Tok.getLocation(); |
| |
| switch (Tok.getKind()) { |
| default: |
| // If this is not a type-qualifier token, we're done reading type |
| // qualifiers. First verify that DeclSpec's are consistent. |
| DS.Finish(Diags, getLang()); |
| return; |
| case tok::kw_const: |
| isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec, |
| getLang())*2; |
| break; |
| case tok::kw_volatile: |
| isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, |
| getLang())*2; |
| break; |
| case tok::kw_restrict: |
| isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, |
| getLang())*2; |
| break; |
| case tok::kw___attribute: |
| DS.AddAttributes(ParseAttributes()); |
| continue; // do *not* consume the next token! |
| } |
| |
| // If the specifier combination wasn't legal, issue a diagnostic. |
| if (isInvalid) { |
| assert(PrevSpec && "Method did not return previous specifier!"); |
| if (isInvalid == 1) // Error. |
| Diag(Tok, diag::err_invalid_decl_spec_combination, PrevSpec); |
| else // extwarn. |
| Diag(Tok, diag::ext_duplicate_declspec, PrevSpec); |
| } |
| ConsumeToken(); |
| } |
| } |
| |
| |
| /// ParseDeclarator - Parse and verify a newly-initialized declarator. |
| /// |
| void Parser::ParseDeclarator(Declarator &D) { |
| /// This implements the 'declarator' production in the C grammar, then checks |
| /// for well-formedness and issues diagnostics. |
| ParseDeclaratorInternal(D); |
| |
| // TODO: validate D. |
| |
| } |
| |
| /// ParseDeclaratorInternal |
| /// declarator: [C99 6.7.5] |
| /// pointer[opt] direct-declarator |
| /// [C++] '&' declarator [C++ 8p4, dcl.decl] |
| /// [GNU] '&' restrict[opt] attributes[opt] declarator |
| /// |
| /// pointer: [C99 6.7.5] |
| /// '*' type-qualifier-list[opt] |
| /// '*' type-qualifier-list[opt] pointer |
| /// |
| void Parser::ParseDeclaratorInternal(Declarator &D) { |
| tok::TokenKind Kind = Tok.getKind(); |
| |
| // Not a pointer or C++ reference. |
| if (Kind != tok::star && !(Kind == tok::amp && getLang().CPlusPlus)) |
| return ParseDirectDeclarator(D); |
| |
| // Otherwise, '*' -> pointer or '&' -> reference. |
| SourceLocation Loc = ConsumeToken(); // Eat the * or &. |
| |
| if (Kind == tok::star) { |
| // Is a pointer |
| DeclSpec DS; |
| |
| ParseTypeQualifierListOpt(DS); |
| |
| // Recursively parse the declarator. |
| ParseDeclaratorInternal(D); |
| |
| // Remember that we parsed a pointer type, and remember the type-quals. |
| D.AddTypeInfo(DeclaratorChunk::getPointer(DS.getTypeQualifiers(), Loc)); |
| } else { |
| // Is a reference |
| DeclSpec DS; |
| |
| // C++ 8.3.2p1: cv-qualified references are ill-formed except when the |
| // cv-qualifiers are introduced through the use of a typedef or of a |
| // template type argument, in which case the cv-qualifiers are ignored. |
| // |
| // [GNU] Retricted references are allowed. |
| // [GNU] Attributes on references are allowed. |
| ParseTypeQualifierListOpt(DS); |
| |
| if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) { |
| if (DS.getTypeQualifiers() & DeclSpec::TQ_const) |
| Diag(DS.getConstSpecLoc(), |
| diag::err_invalid_reference_qualifier_application, |
| "const"); |
| if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) |
| Diag(DS.getVolatileSpecLoc(), |
| diag::err_invalid_reference_qualifier_application, |
| "volatile"); |
| } |
| |
| // Recursively parse the declarator. |
| ParseDeclaratorInternal(D); |
| |
| // Remember that we parsed a reference type. It doesn't have type-quals. |
| D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc)); |
| } |
| } |
| |
| /// ParseDirectDeclarator |
| /// direct-declarator: [C99 6.7.5] |
| /// identifier |
| /// '(' declarator ')' |
| /// [GNU] '(' attributes declarator ')' |
| /// [C90] direct-declarator '[' constant-expression[opt] ']' |
| /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']' |
| /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']' |
| /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']' |
| /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']' |
| /// direct-declarator '(' parameter-type-list ')' |
| /// direct-declarator '(' identifier-list[opt] ')' |
| /// [GNU] direct-declarator '(' parameter-forward-declarations |
| /// parameter-type-list[opt] ')' |
| /// |
| void Parser::ParseDirectDeclarator(Declarator &D) { |
| // Parse the first direct-declarator seen. |
| if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) { |
| assert(Tok.getIdentifierInfo() && "Not an identifier?"); |
| D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); |
| ConsumeToken(); |
| } else if (Tok.is(tok::l_paren)) { |
| // direct-declarator: '(' declarator ')' |
| // direct-declarator: '(' attributes declarator ')' |
| // Example: 'char (*X)' or 'int (*XX)(void)' |
| ParseParenDeclarator(D); |
| } else if (D.mayOmitIdentifier()) { |
| // This could be something simple like "int" (in which case the declarator |
| // portion is empty), if an abstract-declarator is allowed. |
| D.SetIdentifier(0, Tok.getLocation()); |
| } else { |
| // Expected identifier or '('. |
| Diag(Tok, diag::err_expected_ident_lparen); |
| D.SetIdentifier(0, Tok.getLocation()); |
| } |
| |
| assert(D.isPastIdentifier() && |
| "Haven't past the location of the identifier yet?"); |
| |
| while (1) { |
| if (Tok.is(tok::l_paren)) { |
| ParseParenDeclarator(D); |
| } else if (Tok.is(tok::l_square)) { |
| ParseBracketDeclarator(D); |
| } else { |
| break; |
| } |
| } |
| } |
| |
| /// ParseParenDeclarator - We parsed the declarator D up to a paren. This may |
| /// either be before the identifier (in which case these are just grouping |
| /// parens for precedence) or it may be after the identifier, in which case |
| /// these are function arguments. |
| /// |
| /// This method also handles this portion of the grammar: |
| /// parameter-type-list: [C99 6.7.5] |
| /// parameter-list |
| /// parameter-list ',' '...' |
| /// |
| /// parameter-list: [C99 6.7.5] |
| /// parameter-declaration |
| /// parameter-list ',' parameter-declaration |
| /// |
| /// parameter-declaration: [C99 6.7.5] |
| /// declaration-specifiers declarator |
| /// [GNU] declaration-specifiers declarator attributes |
| /// declaration-specifiers abstract-declarator[opt] |
| /// [GNU] declaration-specifiers abstract-declarator[opt] attributes |
| /// |
| /// identifier-list: [C99 6.7.5] |
| /// identifier |
| /// identifier-list ',' identifier |
| /// |
| void Parser::ParseParenDeclarator(Declarator &D) { |
| SourceLocation StartLoc = ConsumeParen(); |
| |
| // If we haven't past the identifier yet (or where the identifier would be |
| // stored, if this is an abstract declarator), then this is probably just |
| // grouping parens. |
| if (!D.isPastIdentifier()) { |
| // Okay, this is probably a grouping paren. However, if this could be an |
| // abstract-declarator, then this could also be the start of function |
| // arguments (consider 'void()'). |
| bool isGrouping; |
| |
| if (!D.mayOmitIdentifier()) { |
| // If this can't be an abstract-declarator, this *must* be a grouping |
| // paren, because we haven't seen the identifier yet. |
| isGrouping = true; |
| } else if (Tok.is(tok::r_paren) || // 'int()' is a function. |
| isDeclarationSpecifier()) { // 'int(int)' is a function. |
| // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is |
| // considered to be a type, not a K&R identifier-list. |
| isGrouping = false; |
| } else { |
| // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'. |
| isGrouping = true; |
| } |
| |
| // If this is a grouping paren, handle: |
| // direct-declarator: '(' declarator ')' |
| // direct-declarator: '(' attributes declarator ')' |
| if (isGrouping) { |
| if (Tok.is(tok::kw___attribute)) |
| D.AddAttributes(ParseAttributes()); |
| |
| ParseDeclaratorInternal(D); |
| // Match the ')'. |
| MatchRHSPunctuation(tok::r_paren, StartLoc); |
| return; |
| } |
| |
| // Okay, if this wasn't a grouping paren, it must be the start of a function |
| // argument list. Recognize that this declarator will never have an |
| // identifier (and remember where it would have been), then fall through to |
| // the handling of argument lists. |
| D.SetIdentifier(0, Tok.getLocation()); |
| } |
| |
| // Okay, this is the parameter list of a function definition, or it is an |
| // identifier list of a K&R-style function. |
| bool IsVariadic; |
| bool HasPrototype; |
| bool ErrorEmitted = false; |
| |
| // Build up an array of information about the parsed arguments. |
| llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo; |
| llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar; |
| |
| if (Tok.is(tok::r_paren)) { |
| // int() -> no prototype, no '...'. |
| IsVariadic = false; |
| HasPrototype = false; |
| } else if (Tok.is(tok::identifier) && |
| // K&R identifier lists can't have typedefs as identifiers, per |
| // C99 6.7.5.3p11. |
| !Actions.isTypeName(*Tok.getIdentifierInfo(), CurScope)) { |
| // Identifier list. Note that '(' identifier-list ')' is only allowed for |
| // normal declarators, not for abstract-declarators. |
| assert(D.isPastIdentifier() && "Identifier (if present) must be passed!"); |
| |
| // If there was no identifier specified, either we are in an |
| // abstract-declarator, or we are in a parameter declarator which was found |
| // to be abstract. In abstract-declarators, identifier lists are not valid, |
| // diagnose this. |
| if (!D.getIdentifier()) |
| Diag(Tok, diag::ext_ident_list_in_param); |
| |
| // Remember this identifier in ParamInfo. |
| ParamInfo.push_back(DeclaratorChunk::ParamInfo(Tok.getIdentifierInfo(), |
| Tok.getLocation(), 0)); |
| |
| ConsumeToken(); |
| while (Tok.is(tok::comma)) { |
| // Eat the comma. |
| ConsumeToken(); |
| |
| if (Tok.isNot(tok::identifier)) { |
| Diag(Tok, diag::err_expected_ident); |
| ErrorEmitted = true; |
| break; |
| } |
| |
| IdentifierInfo *ParmII = Tok.getIdentifierInfo(); |
| |
| // Verify that the argument identifier has not already been mentioned. |
| if (!ParamsSoFar.insert(ParmII)) { |
| Diag(Tok.getLocation(), diag::err_param_redefinition,ParmII->getName()); |
| ParmII = 0; |
| } |
| |
| // Remember this identifier in ParamInfo. |
| if (ParmII) |
| ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII, |
| Tok.getLocation(), 0)); |
| |
| // Eat the identifier. |
| ConsumeToken(); |
| } |
| |
| // K&R 'prototype'. |
| IsVariadic = false; |
| HasPrototype = false; |
| } else { |
| // Finally, a normal, non-empty parameter type list. |
| |
| // Enter function-declaration scope, limiting any declarators for struct |
| // tags to the function prototype scope. |
| // FIXME: is this needed? |
| EnterScope(Scope::DeclScope); |
| |
| IsVariadic = false; |
| while (1) { |
| if (Tok.is(tok::ellipsis)) { |
| IsVariadic = true; |
| |
| // Check to see if this is "void(...)" which is not allowed. |
| if (ParamInfo.empty()) { |
| // Otherwise, parse parameter type list. If it starts with an |
| // ellipsis, diagnose the malformed function. |
| Diag(Tok, diag::err_ellipsis_first_arg); |
| IsVariadic = false; // Treat this like 'void()'. |
| } |
| |
| // Consume the ellipsis. |
| ConsumeToken(); |
| break; |
| } |
| |
| // Parse the declaration-specifiers. |
| DeclSpec DS; |
| ParseDeclarationSpecifiers(DS); |
| |
| // Parse the declarator. This is "PrototypeContext", because we must |
| // accept either 'declarator' or 'abstract-declarator' here. |
| Declarator ParmDecl(DS, Declarator::PrototypeContext); |
| ParseDeclarator(ParmDecl); |
| |
| // Parse GNU attributes, if present. |
| if (Tok.is(tok::kw___attribute)) |
| ParmDecl.AddAttributes(ParseAttributes()); |
| |
| // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. |
| // NOTE: we could trivially allow 'int foo(auto int X)' if we wanted. |
| 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(); |
| } |
| |
| // Inform the actions module about the parameter declarator, so it gets |
| // added to the current scope. |
| Action::TypeResult ParamTy = |
| Actions.ActOnParamDeclaratorType(CurScope, ParmDecl); |
| |
| // Remember this parsed parameter in ParamInfo. |
| IdentifierInfo *ParmII = ParmDecl.getIdentifier(); |
| |
| // Verify that the argument identifier has not already been mentioned. |
| if (ParmII && !ParamsSoFar.insert(ParmII)) { |
| Diag(ParmDecl.getIdentifierLoc(), diag::err_param_redefinition, |
| ParmII->getName()); |
| ParmII = 0; |
| } |
| |
| ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII, |
| ParmDecl.getIdentifierLoc(), ParamTy.Val, ParmDecl.getInvalidType(), |
| ParmDecl.getDeclSpec().getAttributes())); |
| |
| // Ownership of DeclSpec has been handed off to ParamInfo. |
| DS.clearAttributes(); |
| |
| // If the next token is a comma, consume it and keep reading arguments. |
| if (Tok.isNot(tok::comma)) break; |
| |
| // Consume the comma. |
| ConsumeToken(); |
| } |
| |
| HasPrototype = true; |
| |
| // Leave prototype scope. |
| ExitScope(); |
| } |
| |
| // Remember that we parsed a function type, and remember the attributes. |
| if (!ErrorEmitted) |
| D.AddTypeInfo(DeclaratorChunk::getFunction(HasPrototype, IsVariadic, |
| &ParamInfo[0], ParamInfo.size(), |
| StartLoc)); |
| |
| // If we have the closing ')', eat it and we're done. |
| if (Tok.is(tok::r_paren)) { |
| ConsumeParen(); |
| } else { |
| // If an error happened earlier parsing something else in the proto, don't |
| // issue another error. |
| if (!ErrorEmitted) |
| Diag(Tok, diag::err_expected_rparen); |
| SkipUntil(tok::r_paren); |
| } |
| } |
| |
| |
| /// [C90] direct-declarator '[' constant-expression[opt] ']' |
| /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']' |
| /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']' |
| /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']' |
| /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']' |
| void Parser::ParseBracketDeclarator(Declarator &D) { |
| SourceLocation StartLoc = ConsumeBracket(); |
| |
| // If valid, this location is the position where we read the 'static' keyword. |
| SourceLocation StaticLoc; |
| if (Tok.is(tok::kw_static)) |
| StaticLoc = ConsumeToken(); |
| |
| // If there is a type-qualifier-list, read it now. |
| DeclSpec DS; |
| ParseTypeQualifierListOpt(DS); |
| |
| // If we haven't already read 'static', check to see if there is one after the |
| // type-qualifier-list. |
| if (!StaticLoc.isValid() && Tok.is(tok::kw_static)) |
| StaticLoc = ConsumeToken(); |
| |
| // Handle "direct-declarator [ type-qual-list[opt] * ]". |
| bool isStar = false; |
| ExprResult NumElements(false); |
| if (Tok.is(tok::star)) { |
| // Remember the '*' token, in case we have to un-get it. |
| Token StarTok = Tok; |
| ConsumeToken(); |
| |
| // Check that the ']' token is present to avoid incorrectly parsing |
| // expressions starting with '*' as [*]. |
| if (Tok.is(tok::r_square)) { |
| if (StaticLoc.isValid()) |
| Diag(StaticLoc, diag::err_unspecified_vla_size_with_static); |
| StaticLoc = SourceLocation(); // Drop the static. |
| isStar = true; |
| } else { |
| // Otherwise, the * must have been some expression (such as '*ptr') that |
| // started an assignment-expr. We already consumed the token, but now we |
| // need to reparse it. This handles cases like 'X[*p + 4]' |
| NumElements = ParseAssignmentExpressionWithLeadingStar(StarTok); |
| } |
| } else if (Tok.isNot(tok::r_square)) { |
| // Parse the assignment-expression now. |
| NumElements = ParseAssignmentExpression(); |
| } |
| |
| // If there was an error parsing the assignment-expression, recover. |
| if (NumElements.isInvalid) { |
| // If the expression was invalid, skip it. |
| SkipUntil(tok::r_square); |
| return; |
| } |
| |
| MatchRHSPunctuation(tok::r_square, StartLoc); |
| |
| // If C99 isn't enabled, emit an ext-warn if the arg list wasn't empty and if |
| // it was not a constant expression. |
| if (!getLang().C99) { |
| // TODO: check C90 array constant exprness. |
| if (isStar || StaticLoc.isValid() || |
| 0/*TODO: NumElts is not a C90 constantexpr */) |
| Diag(StartLoc, diag::ext_c99_array_usage); |
| } |
| |
| // Remember that we parsed a pointer type, and remember the type-quals. |
| D.AddTypeInfo(DeclaratorChunk::getArray(DS.getTypeQualifiers(), |
| StaticLoc.isValid(), isStar, |
| NumElements.Val, StartLoc)); |
| } |
| |
| /// [GNU] typeof-specifier: |
| /// typeof ( expressions ) |
| /// typeof ( type-name ) |
| /// |
| void Parser::ParseTypeofSpecifier(DeclSpec &DS) { |
| assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier"); |
| const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); |
| SourceLocation StartLoc = ConsumeToken(); |
| |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(Tok, diag::err_expected_lparen_after, BuiltinII->getName()); |
| return; |
| } |
| SourceLocation LParenLoc = ConsumeParen(), RParenLoc; |
| |
| if (isTypeSpecifierQualifier()) { |
| TypeTy *Ty = ParseTypeName(); |
| |
| assert(Ty && "Parser::ParseTypeofSpecifier(): missing type"); |
| |
| if (Tok.isNot(tok::r_paren)) { |
| MatchRHSPunctuation(tok::r_paren, LParenLoc); |
| return; |
| } |
| RParenLoc = ConsumeParen(); |
| const char *PrevSpec = 0; |
| // Check for duplicate type specifiers (e.g. "int typeof(int)"). |
| if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec, Ty)) |
| Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec); |
| } else { // we have an expression. |
| ExprResult Result = ParseExpression(); |
| |
| if (Result.isInvalid || Tok.isNot(tok::r_paren)) { |
| MatchRHSPunctuation(tok::r_paren, LParenLoc); |
| return; |
| } |
| RParenLoc = ConsumeParen(); |
| const char *PrevSpec = 0; |
| // Check for duplicate type specifiers (e.g. "int typeof(int)"). |
| if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec, |
| Result.Val)) |
| Diag(StartLoc, diag::err_invalid_decl_spec_combination, PrevSpec); |
| } |
| } |
| |