| //===--- Sema.h - Semantic Analysis & AST Building --------------*- C++ -*-===// |
| // |
| // 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 defines the Sema class, which performs semantic analysis and |
| // builds ASTs. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_AST_SEMA_H |
| #define LLVM_CLANG_AST_SEMA_H |
| |
| #include "clang/Parse/Action.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include <vector> |
| #include <string> |
| |
| namespace llvm { |
| class APSInt; |
| } |
| |
| namespace clang { |
| class ASTContext; |
| class Preprocessor; |
| class Decl; |
| class Expr; |
| class VarDecl; |
| class ParmVarDecl; |
| class TypedefDecl; |
| class FunctionDecl; |
| class QualType; |
| class LangOptions; |
| class DeclaratorChunk; |
| class Token; |
| class IntegerLiteral; |
| class ArrayType; |
| class LabelStmt; |
| class SwitchStmt; |
| class OCUVectorType; |
| class TypedefDecl; |
| |
| /// Sema - This implements semantic analysis and AST building for C. |
| class Sema : public Action { |
| Preprocessor &PP; |
| |
| ASTContext &Context; |
| |
| /// CurFunctionDecl - If inside of a function body, this contains a pointer to |
| /// the function decl for the function being parsed. |
| FunctionDecl *CurFunctionDecl; |
| |
| /// LastInGroupList - This vector is populated when there are multiple |
| /// declarators in a single decl group (e.g. "int A, B, C"). In this case, |
| /// all but the last decl will be entered into this. This is used by the |
| /// ASTStreamer. |
| std::vector<Decl*> &LastInGroupList; |
| |
| /// LabelMap - This is a mapping from label identifiers to the LabelStmt for |
| /// it (which acts like the label decl in some ways). Forward referenced |
| /// labels have a LabelStmt created for them with a null location & SubStmt. |
| llvm::DenseMap<IdentifierInfo*, LabelStmt*> LabelMap; |
| |
| llvm::SmallVector<SwitchStmt*, 8> SwitchStack; |
| |
| /// OCUVectorDecls - This is a list all the OCU vector types. This allows |
| /// us to associate a raw vector type with one of the OCU type names. |
| /// This is only necessary for issuing pretty diagnostics. |
| llvm::SmallVector<TypedefDecl*, 24> OCUVectorDecls; |
| |
| // Enum values used by KnownFunctionIDs (see below). |
| enum { |
| id_printf, |
| id_fprintf, |
| id_sprintf, |
| id_snprintf, |
| id_asprintf, |
| id_vsnprintf, |
| id_vasprintf, |
| id_vfprintf, |
| id_vsprintf, |
| id_vprintf, |
| id_num_known_functions |
| }; |
| |
| /// KnownFunctionIDs - This is a list of IdentifierInfo objects to a set |
| /// of known functions used by the semantic analysis to do various |
| /// kinds of checking (e.g. checking format string errors in printf calls). |
| /// This list is populated upon the creation of a Sema object. |
| IdentifierInfo* KnownFunctionIDs[ id_num_known_functions ]; |
| |
| public: |
| Sema(Preprocessor &pp, ASTContext &ctxt, std::vector<Decl*> &prevInGroup); |
| |
| const LangOptions &getLangOptions() const; |
| |
| /// The primitive diagnostic helpers - always returns true, which simplifies |
| /// error handling (i.e. less code). |
| bool Diag(SourceLocation Loc, unsigned DiagID); |
| bool Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg); |
| bool Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1, |
| const std::string &Msg2); |
| |
| /// More expressive diagnostic helpers for expressions (say that 6 times:-) |
| bool Diag(SourceLocation Loc, unsigned DiagID, SourceRange R1); |
| bool Diag(SourceLocation Loc, unsigned DiagID, |
| SourceRange R1, SourceRange R2); |
| bool Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg, |
| SourceRange R1); |
| bool Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg, |
| SourceRange R1, SourceRange R2); |
| bool Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1, |
| const std::string &Msg2, SourceRange R1); |
| bool Diag(SourceLocation Loc, unsigned DiagID, |
| const std::string &Msg1, const std::string &Msg2, |
| SourceRange R1, SourceRange R2); |
| |
| //===--------------------------------------------------------------------===// |
| // Type Analysis / Processing: SemaType.cpp. |
| // |
| QualType GetTypeForDeclarator(Declarator &D, Scope *S); |
| |
| virtual TypeResult ParseTypeName(Scope *S, Declarator &D); |
| |
| virtual TypeResult ParseParamDeclaratorType(Scope *S, Declarator &D); |
| private: |
| //===--------------------------------------------------------------------===// |
| // Symbol table / Decl tracking callbacks: SemaDecl.cpp. |
| // |
| virtual DeclTy *isTypeName(const IdentifierInfo &II, Scope *S) const; |
| virtual DeclTy *ParseDeclarator(Scope *S, Declarator &D, ExprTy *Init, |
| DeclTy *LastInGroup); |
| virtual DeclTy *FinalizeDeclaratorGroup(Scope *S, DeclTy *Group); |
| |
| virtual DeclTy *ParseStartOfFunctionDef(Scope *S, Declarator &D); |
| virtual DeclTy *ParseFunctionDefBody(DeclTy *Decl, StmtTy *Body); |
| virtual void PopScope(SourceLocation Loc, Scope *S); |
| |
| /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with |
| /// no declarator (e.g. "struct foo;") is parsed. |
| virtual DeclTy *ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS); |
| |
| virtual DeclTy *ParseTag(Scope *S, unsigned TagType, TagKind TK, |
| SourceLocation KWLoc, IdentifierInfo *Name, |
| SourceLocation NameLoc, AttributeList *Attr); |
| virtual DeclTy *ParseField(Scope *S, DeclTy *TagDecl,SourceLocation DeclStart, |
| Declarator &D, ExprTy *BitfieldWidth); |
| virtual void ParseRecordBody(SourceLocation RecLoc, DeclTy *TagDecl, |
| DeclTy **Fields, unsigned NumFields); |
| virtual DeclTy *ParseEnumConstant(Scope *S, DeclTy *EnumDecl, |
| DeclTy *LastEnumConstant, |
| SourceLocation IdLoc, IdentifierInfo *Id, |
| SourceLocation EqualLoc, ExprTy *Val); |
| virtual void ParseEnumBody(SourceLocation EnumLoc, DeclTy *EnumDecl, |
| DeclTy **Elements, unsigned NumElements); |
| private: |
| /// Subroutines of ParseDeclarator()... |
| TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, Decl *LastDeclarator); |
| TypedefDecl *MergeTypeDefDecl(TypedefDecl *New, Decl *Old); |
| FunctionDecl *MergeFunctionDecl(FunctionDecl *New, Decl *Old); |
| VarDecl *MergeVarDecl(VarDecl *New, Decl *Old); |
| /// AddTopLevelDecl - called after the decl has been fully processed. |
| /// Allows for bookkeeping and post-processing of each declaration. |
| void AddTopLevelDecl(Decl *current, Decl *last); |
| |
| /// More parsing and symbol table subroutines... |
| ParmVarDecl *ParseParamDeclarator(DeclaratorChunk &FI, unsigned ArgNo, |
| Scope *FnBodyScope); |
| Decl *LookupScopedDecl(IdentifierInfo *II, unsigned NSI, SourceLocation IdLoc, |
| Scope *S); |
| Decl *LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID, Scope *S); |
| Decl *ImplicitlyDefineFunction(SourceLocation Loc, IdentifierInfo &II, |
| Scope *S); |
| // Decl attributes - this routine is the top level dispatcher. |
| void HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, |
| AttributeList *declarator_postfix); |
| void HandleDeclAttribute(Decl *New, AttributeList *rawAttr); |
| |
| // HandleVectorTypeAttribute - this attribute is only applicable to |
| // integral and float scalars, although arrays, pointers, and function |
| // return values are allowed in conjunction with this construct. Aggregates |
| // with this attribute are invalid, even if they are of the same size as a |
| // corresponding scalar. |
| // The raw attribute should contain precisely 1 argument, the vector size |
| // for the variable, measured in bytes. If curType and rawAttr are well |
| // formed, this routine will return a new vector type. |
| QualType HandleVectorTypeAttribute(QualType curType, AttributeList *rawAttr); |
| void HandleOCUVectorTypeAttribute(TypedefDecl *d, AttributeList *rawAttr); |
| |
| //===--------------------------------------------------------------------===// |
| // Statement Parsing Callbacks: SemaStmt.cpp. |
| public: |
| virtual StmtResult ParseExprStmt(ExprTy *Expr); |
| |
| virtual StmtResult ParseNullStmt(SourceLocation SemiLoc); |
| virtual StmtResult ParseCompoundStmt(SourceLocation L, SourceLocation R, |
| StmtTy **Elts, unsigned NumElts); |
| virtual StmtResult ParseDeclStmt(DeclTy *Decl); |
| virtual StmtResult ParseCaseStmt(SourceLocation CaseLoc, ExprTy *LHSVal, |
| SourceLocation DotDotDotLoc, ExprTy *RHSVal, |
| SourceLocation ColonLoc, StmtTy *SubStmt); |
| virtual StmtResult ParseDefaultStmt(SourceLocation DefaultLoc, |
| SourceLocation ColonLoc, StmtTy *SubStmt, |
| Scope *CurScope); |
| virtual StmtResult ParseLabelStmt(SourceLocation IdentLoc, IdentifierInfo *II, |
| SourceLocation ColonLoc, StmtTy *SubStmt); |
| virtual StmtResult ParseIfStmt(SourceLocation IfLoc, ExprTy *CondVal, |
| StmtTy *ThenVal, SourceLocation ElseLoc, |
| StmtTy *ElseVal); |
| virtual StmtResult StartSwitchStmt(ExprTy *Cond); |
| virtual StmtResult FinishSwitchStmt(SourceLocation SwitchLoc, StmtTy *Switch, |
| ExprTy *Body); |
| virtual StmtResult ParseWhileStmt(SourceLocation WhileLoc, ExprTy *Cond, |
| StmtTy *Body); |
| virtual StmtResult ParseDoStmt(SourceLocation DoLoc, StmtTy *Body, |
| SourceLocation WhileLoc, ExprTy *Cond); |
| |
| virtual StmtResult ParseForStmt(SourceLocation ForLoc, |
| SourceLocation LParenLoc, |
| StmtTy *First, ExprTy *Second, ExprTy *Third, |
| SourceLocation RParenLoc, StmtTy *Body); |
| virtual StmtResult ParseGotoStmt(SourceLocation GotoLoc, |
| SourceLocation LabelLoc, |
| IdentifierInfo *LabelII); |
| virtual StmtResult ParseIndirectGotoStmt(SourceLocation GotoLoc, |
| SourceLocation StarLoc, |
| ExprTy *DestExp); |
| virtual StmtResult ParseContinueStmt(SourceLocation ContinueLoc, |
| Scope *CurScope); |
| virtual StmtResult ParseBreakStmt(SourceLocation GotoLoc, Scope *CurScope); |
| |
| virtual StmtResult ParseReturnStmt(SourceLocation ReturnLoc, |
| ExprTy *RetValExp); |
| |
| //===--------------------------------------------------------------------===// |
| // Expression Parsing Callbacks: SemaExpr.cpp. |
| |
| // Primary Expressions. |
| virtual ExprResult ParseIdentifierExpr(Scope *S, SourceLocation Loc, |
| IdentifierInfo &II, |
| bool HasTrailingLParen); |
| virtual ExprResult ParsePreDefinedExpr(SourceLocation Loc, |
| tok::TokenKind Kind); |
| virtual ExprResult ParseNumericConstant(const Token &); |
| virtual ExprResult ParseCharacterConstant(const Token &); |
| virtual ExprResult ParseParenExpr(SourceLocation L, SourceLocation R, |
| ExprTy *Val); |
| |
| /// ParseStringLiteral - The specified tokens were lexed as pasted string |
| /// fragments (e.g. "foo" "bar" L"baz"). |
| virtual ExprResult ParseStringLiteral(const Token *Toks, unsigned NumToks); |
| |
| // Binary/Unary Operators. 'Tok' is the token for the operator. |
| virtual ExprResult ParseUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, |
| ExprTy *Input); |
| virtual ExprResult |
| ParseSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, |
| SourceLocation LParenLoc, TypeTy *Ty, |
| SourceLocation RParenLoc); |
| |
| virtual ExprResult ParsePostfixUnaryOp(SourceLocation OpLoc, |
| tok::TokenKind Kind, ExprTy *Input); |
| |
| virtual ExprResult ParseArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, |
| ExprTy *Idx, SourceLocation RLoc); |
| virtual ExprResult ParseMemberReferenceExpr(ExprTy *Base,SourceLocation OpLoc, |
| tok::TokenKind OpKind, |
| SourceLocation MemberLoc, |
| IdentifierInfo &Member); |
| |
| /// ParseCallExpr - Handle a call to Fn with the specified array of arguments. |
| /// This provides the location of the left/right parens and a list of comma |
| /// locations. |
| virtual ExprResult ParseCallExpr(ExprTy *Fn, SourceLocation LParenLoc, |
| ExprTy **Args, unsigned NumArgs, |
| SourceLocation *CommaLocs, |
| SourceLocation RParenLoc); |
| |
| virtual ExprResult ParseCastExpr(SourceLocation LParenLoc, TypeTy *Ty, |
| SourceLocation RParenLoc, ExprTy *Op); |
| |
| virtual ExprResult ParseCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, |
| SourceLocation RParenLoc, ExprTy *Op); |
| |
| virtual ExprResult ParseInitList(SourceLocation LParenLoc, |
| ExprTy **InitList, unsigned NumInit, |
| SourceLocation RParenLoc); |
| |
| virtual ExprResult ParseBinOp(SourceLocation TokLoc, tok::TokenKind Kind, |
| ExprTy *LHS,ExprTy *RHS); |
| |
| /// ParseConditionalOp - Parse a ?: operation. Note that 'LHS' may be null |
| /// in the case of a the GNU conditional expr extension. |
| virtual ExprResult ParseConditionalOp(SourceLocation QuestionLoc, |
| SourceLocation ColonLoc, |
| ExprTy *Cond, ExprTy *LHS, ExprTy *RHS); |
| |
| /// ParseAddrLabel - Parse the GNU address of label extension: "&&foo". |
| virtual ExprResult ParseAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc, |
| IdentifierInfo *LabelII); |
| |
| virtual ExprResult ParseStmtExpr(SourceLocation LPLoc, StmtTy *SubStmt, |
| SourceLocation RPLoc); // "({..})" |
| |
| // __builtin_types_compatible_p(type1, type2) |
| virtual ExprResult ParseTypesCompatibleExpr(SourceLocation BuiltinLoc, |
| TypeTy *arg1, TypeTy *arg2, |
| SourceLocation RPLoc); |
| |
| // __builtin_choose_expr(constExpr, expr1, expr2) |
| virtual ExprResult ParseChooseExpr(SourceLocation BuiltinLoc, |
| ExprTy *cond, ExprTy *expr1, ExprTy *expr2, |
| SourceLocation RPLoc); |
| |
| /// ParseCXXCasts - Parse {dynamic,static,reinterpret,const}_cast's. |
| virtual ExprResult ParseCXXCasts(SourceLocation OpLoc, tok::TokenKind Kind, |
| SourceLocation LAngleBracketLoc, TypeTy *Ty, |
| SourceLocation RAngleBracketLoc, |
| SourceLocation LParenLoc, ExprTy *E, |
| SourceLocation RParenLoc); |
| |
| /// ParseCXXBoolLiteral - Parse {true,false} literals. |
| virtual ExprResult ParseCXXBoolLiteral(SourceLocation OpLoc, |
| tok::TokenKind Kind); |
| |
| // ParseObjCStringLiteral - Parse Objective-C string literals. |
| virtual ExprResult ParseObjCStringLiteral(ExprTy *string); |
| virtual ExprResult ParseObjCEncodeExpression(SourceLocation AtLoc, |
| SourceLocation LParenLoc, |
| TypeTy *Ty, |
| SourceLocation RParenLoc); |
| |
| private: |
| // UsualUnaryConversions - promotes integers (C99 6.3.1.1p2) and converts |
| // functions and arrays to their respective pointers (C99 6.3.2.1). |
| void UsualUnaryConversions(Expr *&expr); |
| |
| // DefaultFunctionArrayConversion - converts functions and arrays |
| // to their respective pointers (C99 6.3.2.1). |
| void DefaultFunctionArrayConversion(Expr *&expr); |
| |
| // UsualArithmeticConversions - performs the UsualUnaryConversions on it's |
| // operands and then handles various conversions that are common to binary |
| // operators (C99 6.3.1.8). If both operands aren't arithmetic, this |
| // routine returns the first non-arithmetic type found. The client is |
| // responsible for emitting appropriate error diagnostics. |
| QualType UsualArithmeticConversions(Expr *&lExpr, Expr *&rExpr, |
| bool isCompAssign = false); |
| enum AssignmentCheckResult { |
| Compatible, |
| Incompatible, |
| PointerFromInt, |
| IntFromPointer, |
| IncompatiblePointer, |
| CompatiblePointerDiscardsQualifiers |
| }; |
| // CheckAssignmentConstraints - Perform type checking for assignment, |
| // argument passing, variable initialization, and function return values. |
| // This routine is only used by the following two methods. C99 6.5.16. |
| AssignmentCheckResult CheckAssignmentConstraints(QualType lhs, QualType rhs); |
| |
| // CheckSingleAssignmentConstraints - Currently used by ParseCallExpr, |
| // CheckAssignmentOperands, and ParseReturnStmt. Prior to type checking, |
| // this routine performs the default function/array converions. |
| AssignmentCheckResult CheckSingleAssignmentConstraints(QualType lhs, |
| Expr *&rExpr); |
| // CheckCompoundAssignmentConstraints - Type check without performing any |
| // conversions. For compound assignments, the "Check...Operands" methods |
| // perform the necessary conversions. |
| AssignmentCheckResult CheckCompoundAssignmentConstraints(QualType lhs, |
| QualType rhs); |
| |
| // Helper function for CheckAssignmentConstraints (C99 6.5.16.1p1) |
| AssignmentCheckResult CheckPointerTypesForAssignment(QualType lhsType, |
| QualType rhsType); |
| |
| /// the following "Check" methods will return a valid/converted QualType |
| /// or a null QualType (indicating an error diagnostic was issued). |
| |
| /// type checking binary operators (subroutines of ParseBinOp). |
| inline void InvalidOperands(SourceLocation l, Expr *&lex, Expr *&rex); |
| inline QualType CheckVectorOperands(SourceLocation l, Expr *&lex, Expr *&rex); |
| inline QualType CheckMultiplyDivideOperands( // C99 6.5.5 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isCompAssign = false); |
| inline QualType CheckRemainderOperands( // C99 6.5.5 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isCompAssign = false); |
| inline QualType CheckAdditionOperands( // C99 6.5.6 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isCompAssign = false); |
| inline QualType CheckSubtractionOperands( // C99 6.5.6 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isCompAssign = false); |
| inline QualType CheckShiftOperands( // C99 6.5.7 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isCompAssign = false); |
| inline QualType CheckCompareOperands( // C99 6.5.8/9 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isRelational); |
| inline QualType CheckBitwiseOperands( // C99 6.5.[10...12] |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc, bool isCompAssign = false); |
| inline QualType CheckLogicalOperands( // C99 6.5.[13,14] |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc); |
| // CheckAssignmentOperands is used for both simple and compound assignment. |
| // For simple assignment, pass both expressions and a null converted type. |
| // For compound assignment, pass both expressions and the converted type. |
| inline QualType CheckAssignmentOperands( // C99 6.5.16.[1,2] |
| Expr *lex, Expr *&rex, SourceLocation OpLoc, QualType convertedType); |
| inline QualType CheckCommaOperands( // C99 6.5.17 |
| Expr *&lex, Expr *&rex, SourceLocation OpLoc); |
| inline QualType CheckConditionalOperands( // C99 6.5.15 |
| Expr *&cond, Expr *&lhs, Expr *&rhs, SourceLocation questionLoc); |
| |
| /// type checking unary operators (subroutines of ParseUnaryOp). |
| /// C99 6.5.3.1, 6.5.3.2, 6.5.3.4 |
| QualType CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc); |
| QualType CheckAddressOfOperand(Expr *op, SourceLocation OpLoc); |
| QualType CheckIndirectionOperand(Expr *op, SourceLocation OpLoc); |
| QualType CheckSizeOfAlignOfOperand(QualType type, SourceLocation loc, |
| bool isSizeof); |
| QualType CheckRealImagOperand(Expr *&Op, SourceLocation OpLoc); |
| |
| /// type checking primary expressions. |
| QualType CheckOCUVectorComponent(QualType baseType, SourceLocation OpLoc, |
| IdentifierInfo &Comp, SourceLocation CmpLoc); |
| |
| /// C99: 6.7.5p3: Used by ParseDeclarator/ParseField to make sure we have |
| /// a constant expression of type int with a value greater than zero. If the |
| /// array has an incomplete type or a valid constant size, return false, |
| /// otherwise emit a diagnostic and return true. |
| bool VerifyConstantArrayType(const ArrayType *ary, SourceLocation loc); |
| |
| /// ConvertIntegerToTypeWarnOnOverflow - Convert the specified APInt to have |
| /// the specified width and sign. If an overflow occurs, detect it and emit |
| /// the specified diagnostic. |
| void ConvertIntegerToTypeWarnOnOverflow(llvm::APSInt &OldVal, |
| unsigned NewWidth, bool NewSign, |
| SourceLocation Loc, unsigned DiagID); |
| |
| //===--------------------------------------------------------------------===// |
| // Extra semantic analysis beyond the C type system |
| private: |
| |
| bool CheckFunctionCall(Expr *Fn, |
| SourceLocation LParenLoc, SourceLocation RParenLoc, |
| FunctionDecl *FDecl, |
| Expr** Args, unsigned NumArgsInCall); |
| |
| void CheckPrintfArguments(Expr *Fn, |
| SourceLocation LParenLoc, SourceLocation RParenLoc, |
| bool HasVAListArg, FunctionDecl *FDecl, |
| unsigned format_idx, Expr** Args, |
| unsigned NumArgsInCall); |
| |
| void CheckReturnStackAddr(Expr *RetValExp, QualType lhsType, |
| SourceLocation ReturnLoc); |
| |
| |
| bool CheckBuiltinCFStringArgument(Expr* Arg); |
| }; |
| |
| |
| } // end namespace clang |
| |
| #endif |