path: root/Sema/Sema.h

//===--- 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 <vector>
#include <string>

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 LexerToken;
  class IntegerLiteral;
  class ArrayType;
  class LabelStmt;
  
/// 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;
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);
  
  //===--------------------------------------------------------------------===//
  // 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);
  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 ParseSwitchStmt(SourceLocation SwitchLoc, ExprTy *Cond,
                                     StmtTy *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