Sema.cpp revision 06f548596beef4c0a227a45cba996497f99566c0
1//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the actions class which performs semantic analysis and 11// builds an AST out of a parse stream. 12// 13//===----------------------------------------------------------------------===// 14 15#include "Sema.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/Expr.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Basic/Diagnostic.h" 21 22using namespace clang; 23 24bool Sema::isBuiltinObjCType(TypedefDecl *TD) { 25 const char *typeName = TD->getIdentifier()->getName(); 26 return strcmp(typeName, "id") == 0 || strcmp(typeName, "Class") == 0 || 27 strcmp(typeName, "SEL") == 0 || strcmp(typeName, "Protocol") == 0; 28} 29 30void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) { 31 TUScope = S; 32 CurContext = Context.getTranslationUnitDecl(); 33 if (!PP.getLangOptions().ObjC1) return; 34 35 // Synthesize "typedef struct objc_selector *SEL;" 36 RecordDecl *SelTag = RecordDecl::Create(Context, TagDecl::TK_struct, 37 CurContext, 38 SourceLocation(), 39 &Context.Idents.get("objc_selector"), 40 0); 41 PushOnScopeChains(SelTag, TUScope); 42 43 QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag)); 44 TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext, 45 SourceLocation(), 46 &Context.Idents.get("SEL"), 47 SelT, 0); 48 PushOnScopeChains(SelTypedef, TUScope); 49 Context.setObjCSelType(SelTypedef); 50 51 // FIXME: Make sure these don't leak! 52 RecordDecl *ClassTag = RecordDecl::Create(Context, TagDecl::TK_struct, 53 CurContext, 54 SourceLocation(), 55 &Context.Idents.get("objc_class"), 56 0); 57 QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag)); 58 TypedefDecl *ClassTypedef = 59 TypedefDecl::Create(Context, CurContext, SourceLocation(), 60 &Context.Idents.get("Class"), ClassT, 0); 61 PushOnScopeChains(ClassTag, TUScope); 62 PushOnScopeChains(ClassTypedef, TUScope); 63 Context.setObjCClassType(ClassTypedef); 64 // Synthesize "@class Protocol; 65 ObjCInterfaceDecl *ProtocolDecl = 66 ObjCInterfaceDecl::Create(Context, SourceLocation(), 67 &Context.Idents.get("Protocol"), 68 SourceLocation(), true); 69 Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl)); 70 PushOnScopeChains(ProtocolDecl, TUScope); 71 72 // Synthesize "typedef struct objc_object { Class isa; } *id;" 73 RecordDecl *ObjectTag = 74 RecordDecl::Create(Context, TagDecl::TK_struct, CurContext, 75 SourceLocation(), 76 &Context.Idents.get("objc_object"), 0); 77 QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag)); 78 PushOnScopeChains(ObjectTag, TUScope); 79 TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext, 80 SourceLocation(), 81 &Context.Idents.get("id"), 82 ObjT, 0); 83 PushOnScopeChains(IdTypedef, TUScope); 84 Context.setObjCIdType(IdTypedef); 85} 86 87Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer) 88 : PP(pp), Context(ctxt), Consumer(consumer), CurContext(0) { 89 90 // Get IdentifierInfo objects for known functions for which we 91 // do extra checking. 92 IdentifierTable &IT = PP.getIdentifierTable(); 93 94 KnownFunctionIDs[id_printf] = &IT.get("printf"); 95 KnownFunctionIDs[id_fprintf] = &IT.get("fprintf"); 96 KnownFunctionIDs[id_sprintf] = &IT.get("sprintf"); 97 KnownFunctionIDs[id_snprintf] = &IT.get("snprintf"); 98 KnownFunctionIDs[id_asprintf] = &IT.get("asprintf"); 99 KnownFunctionIDs[id_NSLog] = &IT.get("NSLog"); 100 KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf"); 101 KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf"); 102 KnownFunctionIDs[id_vfprintf] = &IT.get("vfprintf"); 103 KnownFunctionIDs[id_vsprintf] = &IT.get("vsprintf"); 104 KnownFunctionIDs[id_vprintf] = &IT.get("vprintf"); 105 106 SuperID = &IT.get("super"); 107 108 TUScope = 0; 109 if (getLangOptions().CPlusPlus) 110 FieldCollector.reset(new CXXFieldCollector()); 111} 112 113/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast. 114/// If there is already an implicit cast, merge into the existing one. 115void Sema::ImpCastExprToType(Expr *&Expr, QualType Type) { 116 if (Context.getCanonicalType(Expr->getType()) == 117 Context.getCanonicalType(Type)) return; 118 119 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) 120 ImpCast->setType(Type); 121 else 122 Expr = new ImplicitCastExpr(Type, Expr); 123} 124 125void Sema::DeleteExpr(ExprTy *E) { 126 delete static_cast<Expr*>(E); 127} 128void Sema::DeleteStmt(StmtTy *S) { 129 delete static_cast<Stmt*>(S); 130} 131 132//===----------------------------------------------------------------------===// 133// Helper functions. 134//===----------------------------------------------------------------------===// 135 136bool Sema::Diag(SourceLocation Loc, unsigned DiagID) { 137 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID); 138 return true; 139} 140 141bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg) { 142 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, &Msg, 1); 143 return true; 144} 145 146bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1, 147 const std::string &Msg2) { 148 std::string MsgArr[] = { Msg1, Msg2 }; 149 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, MsgArr, 2); 150 return true; 151} 152 153bool Sema::Diag(SourceLocation Loc, unsigned DiagID, SourceRange Range) { 154 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, 0, 0, &Range,1); 155 return true; 156} 157 158bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg, 159 SourceRange Range) { 160 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, &Msg, 1, &Range,1); 161 return true; 162} 163 164bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1, 165 const std::string &Msg2, SourceRange Range) { 166 std::string MsgArr[] = { Msg1, Msg2 }; 167 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, MsgArr, 2, &Range, 1); 168 return true; 169} 170 171bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg1, 172 const std::string &Msg2, const std::string &Msg3, 173 SourceRange R1) { 174 std::string MsgArr[] = { Msg1, Msg2, Msg3 }; 175 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, MsgArr, 3, &R1, 1); 176 return true; 177} 178 179bool Sema::Diag(SourceLocation Loc, unsigned DiagID, 180 SourceRange R1, SourceRange R2) { 181 SourceRange RangeArr[] = { R1, R2 }; 182 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, 0, 0, RangeArr, 2); 183 return true; 184} 185 186bool Sema::Diag(SourceLocation Loc, unsigned DiagID, const std::string &Msg, 187 SourceRange R1, SourceRange R2) { 188 SourceRange RangeArr[] = { R1, R2 }; 189 PP.getDiagnostics().Report(PP.getFullLoc(Loc), DiagID, &Msg, 1, RangeArr, 2); 190 return true; 191} 192 193bool Sema::Diag(SourceLocation Range, unsigned DiagID, const std::string &Msg1, 194 const std::string &Msg2, SourceRange R1, SourceRange R2) { 195 std::string MsgArr[] = { Msg1, Msg2 }; 196 SourceRange RangeArr[] = { R1, R2 }; 197 PP.getDiagnostics().Report(PP.getFullLoc(Range),DiagID, MsgArr,2,RangeArr, 2); 198 return true; 199} 200 201const LangOptions &Sema::getLangOptions() const { 202 return PP.getLangOptions(); 203} 204 205ObjCMethodDecl *Sema::getCurMethodDecl() { 206 return dyn_cast<ObjCMethodDecl>(CurContext); 207} 208